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/wp-includes/ -> formatting.php (source)

   1  <?php
   2  /**
   3   * Main WordPress Formatting API.
   4   *
   5   * Handles many functions for formatting output.
   6   *
   7   * @package WordPress
   8   */
   9  
  10  /**
  11   * Replaces common plain text characters with formatted entities.
  12   *
  13   * Returns given text with transformations of quotes into smart quotes, apostrophes,
  14   * dashes, ellipses, the trademark symbol, and the multiplication symbol.
  15   *
  16   * As an example,
  17   *
  18   *     'cause today's effort makes it worth tomorrow's "holiday" ...
  19   *
  20   * Becomes:
  21   *
  22   *     &#8217;cause today&#8217;s effort makes it worth tomorrow&#8217;s &#8220;holiday&#8221; &#8230;
  23   *
  24   * Code within certain HTML blocks are skipped.
  25   *
  26   * Do not use this function before the {@see 'init'} action hook; everything will break.
  27   *
  28   * @since 0.71
  29   *
  30   * @global array $wp_cockneyreplace Array of formatted entities for certain common phrases.
  31   * @global array $shortcode_tags
  32   *
  33   * @param string $text  The text to be formatted.
  34   * @param bool   $reset Set to true for unit testing. Translated patterns will reset.
  35   * @return string The string replaced with HTML entities.
  36   */
  37  function wptexturize( $text, $reset = false ) {
  38      global $wp_cockneyreplace, $shortcode_tags;
  39      static $static_characters            = null,
  40          $static_replacements             = null,
  41          $dynamic_characters              = null,
  42          $dynamic_replacements            = null,
  43          $default_no_texturize_tags       = null,
  44          $default_no_texturize_shortcodes = null,
  45          $run_texturize                   = true,
  46          $apos                            = null,
  47          $prime                           = null,
  48          $double_prime                    = null,
  49          $opening_quote                   = null,
  50          $closing_quote                   = null,
  51          $opening_single_quote            = null,
  52          $closing_single_quote            = null,
  53          $open_q_flag                     = '<!--oq-->',
  54          $open_sq_flag                    = '<!--osq-->',
  55          $apos_flag                       = '<!--apos-->';
  56  
  57      // If there's nothing to do, just stop.
  58      if ( empty( $text ) || false === $run_texturize ) {
  59          return $text;
  60      }
  61  
  62      // Set up static variables. Run once only.
  63      if ( $reset || ! isset( $static_characters ) ) {
  64          /**
  65           * Filters whether to skip running wptexturize().
  66           *
  67           * Returning false from the filter will effectively short-circuit wptexturize()
  68           * and return the original text passed to the function instead.
  69           *
  70           * The filter runs only once, the first time wptexturize() is called.
  71           *
  72           * @since 4.0.0
  73           *
  74           * @see wptexturize()
  75           *
  76           * @param bool $run_texturize Whether to short-circuit wptexturize().
  77           */
  78          $run_texturize = apply_filters( 'run_wptexturize', $run_texturize );
  79          if ( false === $run_texturize ) {
  80              return $text;
  81          }
  82  
  83          /* translators: Opening curly double quote. */
  84          $opening_quote = _x( '&#8220;', 'opening curly double quote' );
  85          /* translators: Closing curly double quote. */
  86          $closing_quote = _x( '&#8221;', 'closing curly double quote' );
  87  
  88          /* translators: Apostrophe, for example in 'cause or can't. */
  89          $apos = _x( '&#8217;', 'apostrophe' );
  90  
  91          /* translators: Prime, for example in 9' (nine feet). */
  92          $prime = _x( '&#8242;', 'prime' );
  93          /* translators: Double prime, for example in 9" (nine inches). */
  94          $double_prime = _x( '&#8243;', 'double prime' );
  95  
  96          /* translators: Opening curly single quote. */
  97          $opening_single_quote = _x( '&#8216;', 'opening curly single quote' );
  98          /* translators: Closing curly single quote. */
  99          $closing_single_quote = _x( '&#8217;', 'closing curly single quote' );
 100  
 101          /* translators: En dash. */
 102          $en_dash = _x( '&#8211;', 'en dash' );
 103          /* translators: Em dash. */
 104          $em_dash = _x( '&#8212;', 'em dash' );
 105  
 106          $default_no_texturize_tags       = array( 'pre', 'code', 'kbd', 'style', 'script', 'tt' );
 107          $default_no_texturize_shortcodes = array( 'code' );
 108  
 109          // If a plugin has provided an autocorrect array, use it.
 110          if ( isset( $wp_cockneyreplace ) ) {
 111              $cockney        = array_keys( $wp_cockneyreplace );
 112              $cockneyreplace = array_values( $wp_cockneyreplace );
 113          } else {
 114              /*
 115               * translators: This is a comma-separated list of words that defy the syntax of quotations in normal use,
 116               * for example... 'We do not have enough words yet'... is a typical quoted phrase. But when we write
 117               * lines of code 'til we have enough of 'em, then we need to insert apostrophes instead of quotes.
 118               */
 119              $cockney = explode(
 120                  ',',
 121                  _x(
 122                      "'tain't,'twere,'twas,'tis,'twill,'til,'bout,'nuff,'round,'cause,'em",
 123                      'Comma-separated list of words to texturize in your language'
 124                  )
 125              );
 126  
 127              $cockneyreplace = explode(
 128                  ',',
 129                  _x(
 130                      '&#8217;tain&#8217;t,&#8217;twere,&#8217;twas,&#8217;tis,&#8217;twill,&#8217;til,&#8217;bout,&#8217;nuff,&#8217;round,&#8217;cause,&#8217;em',
 131                      'Comma-separated list of replacement words in your language'
 132                  )
 133              );
 134          }
 135  
 136          $static_characters   = array_merge( array( '...', '``', '\'\'', ' (tm)' ), $cockney );
 137          $static_replacements = array_merge( array( '&#8230;', $opening_quote, $closing_quote, ' &#8482;' ), $cockneyreplace );
 138  
 139          // Pattern-based replacements of characters.
 140          // Sort the remaining patterns into several arrays for performance tuning.
 141          $dynamic_characters   = array(
 142              'apos'  => array(),
 143              'quote' => array(),
 144              'dash'  => array(),
 145          );
 146          $dynamic_replacements = array(
 147              'apos'  => array(),
 148              'quote' => array(),
 149              'dash'  => array(),
 150          );
 151          $dynamic              = array();
 152          $spaces               = wp_spaces_regexp();
 153  
 154          // '99' and '99" are ambiguous among other patterns; assume it's an abbreviated year at the end of a quotation.
 155          if ( "'" !== $apos || "'" !== $closing_single_quote ) {
 156              $dynamic[ '/\'(\d\d)\'(?=\Z|[.,:;!?)}\-\]]|&gt;|' . $spaces . ')/' ] = $apos_flag . '$1' . $closing_single_quote;
 157          }
 158          if ( "'" !== $apos || '"' !== $closing_quote ) {
 159              $dynamic[ '/\'(\d\d)"(?=\Z|[.,:;!?)}\-\]]|&gt;|' . $spaces . ')/' ] = $apos_flag . '$1' . $closing_quote;
 160          }
 161  
 162          // '99 '99s '99's (apostrophe)  But never '9 or '99% or '999 or '99.0.
 163          if ( "'" !== $apos ) {
 164              $dynamic['/\'(?=\d\d(?:\Z|(?![%\d]|[.,]\d)))/'] = $apos_flag;
 165          }
 166  
 167          // Quoted numbers like '0.42'.
 168          if ( "'" !== $opening_single_quote && "'" !== $closing_single_quote ) {
 169              $dynamic[ '/(?<=\A|' . $spaces . ')\'(\d[.,\d]*)\'/' ] = $open_sq_flag . '$1' . $closing_single_quote;
 170          }
 171  
 172          // Single quote at start, or preceded by (, {, <, [, ", -, or spaces.
 173          if ( "'" !== $opening_single_quote ) {
 174              $dynamic[ '/(?<=\A|[([{"\-]|&lt;|' . $spaces . ')\'/' ] = $open_sq_flag;
 175          }
 176  
 177          // Apostrophe in a word. No spaces, double apostrophes, or other punctuation.
 178          if ( "'" !== $apos ) {
 179              $dynamic[ '/(?<!' . $spaces . ')\'(?!\Z|[.,:;!?"\'(){}[\]\-]|&[lg]t;|' . $spaces . ')/' ] = $apos_flag;
 180          }
 181  
 182          $dynamic_characters['apos']   = array_keys( $dynamic );
 183          $dynamic_replacements['apos'] = array_values( $dynamic );
 184          $dynamic                      = array();
 185  
 186          // Quoted numbers like "42".
 187          if ( '"' !== $opening_quote && '"' !== $closing_quote ) {
 188              $dynamic[ '/(?<=\A|' . $spaces . ')"(\d[.,\d]*)"/' ] = $open_q_flag . '$1' . $closing_quote;
 189          }
 190  
 191          // Double quote at start, or preceded by (, {, <, [, -, or spaces, and not followed by spaces.
 192          if ( '"' !== $opening_quote ) {
 193              $dynamic[ '/(?<=\A|[([{\-]|&lt;|' . $spaces . ')"(?!' . $spaces . ')/' ] = $open_q_flag;
 194          }
 195  
 196          $dynamic_characters['quote']   = array_keys( $dynamic );
 197          $dynamic_replacements['quote'] = array_values( $dynamic );
 198          $dynamic                       = array();
 199  
 200          // Dashes and spaces.
 201          $dynamic['/---/'] = $em_dash;
 202          $dynamic[ '/(?<=^|' . $spaces . ')--(?=$|' . $spaces . ')/' ] = $em_dash;
 203          $dynamic['/(?<!xn)--/']                                       = $en_dash;
 204          $dynamic[ '/(?<=^|' . $spaces . ')-(?=$|' . $spaces . ')/' ]  = $en_dash;
 205  
 206          $dynamic_characters['dash']   = array_keys( $dynamic );
 207          $dynamic_replacements['dash'] = array_values( $dynamic );
 208      }
 209  
 210      // Must do this every time in case plugins use these filters in a context sensitive manner.
 211      /**
 212       * Filters the list of HTML elements not to texturize.
 213       *
 214       * @since 2.8.0
 215       *
 216       * @param string[] $default_no_texturize_tags An array of HTML element names.
 217       */
 218      $no_texturize_tags = apply_filters( 'no_texturize_tags', $default_no_texturize_tags );
 219      /**
 220       * Filters the list of shortcodes not to texturize.
 221       *
 222       * @since 2.8.0
 223       *
 224       * @param string[] $default_no_texturize_shortcodes An array of shortcode names.
 225       */
 226      $no_texturize_shortcodes = apply_filters( 'no_texturize_shortcodes', $default_no_texturize_shortcodes );
 227  
 228      $no_texturize_tags_stack       = array();
 229      $no_texturize_shortcodes_stack = array();
 230  
 231      // Look for shortcodes and HTML elements.
 232  
 233      preg_match_all( '@\[/?([^<>&/\[\]\x00-\x20=]++)@', $text, $matches );
 234      $tagnames         = array_intersect( array_keys( $shortcode_tags ), $matches[1] );
 235      $found_shortcodes = ! empty( $tagnames );
 236      $shortcode_regex  = $found_shortcodes ? _get_wptexturize_shortcode_regex( $tagnames ) : '';
 237      $regex            = _get_wptexturize_split_regex( $shortcode_regex );
 238  
 239      $textarr = preg_split( $regex, $text, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
 240  
 241      foreach ( $textarr as &$curl ) {
 242          // Only call _wptexturize_pushpop_element if $curl is a delimiter.
 243          $first = $curl[0];
 244          if ( '<' === $first ) {
 245              if ( '<!--' === substr( $curl, 0, 4 ) ) {
 246                  // This is an HTML comment delimiter.
 247                  continue;
 248              } else {
 249                  // This is an HTML element delimiter.
 250  
 251                  // Replace each & with &#038; unless it already looks like an entity.
 252                  $curl = preg_replace( '/&(?!#(?:\d+|x[a-f0-9]+);|[a-z1-4]{1,8};)/i', '&#038;', $curl );
 253  
 254                  _wptexturize_pushpop_element( $curl, $no_texturize_tags_stack, $no_texturize_tags );
 255              }
 256          } elseif ( '' === trim( $curl ) ) {
 257              // This is a newline between delimiters. Performance improves when we check this.
 258              continue;
 259  
 260          } elseif ( '[' === $first && $found_shortcodes && 1 === preg_match( '/^' . $shortcode_regex . '$/', $curl ) ) {
 261              // This is a shortcode delimiter.
 262  
 263              if ( '[[' !== substr( $curl, 0, 2 ) && ']]' !== substr( $curl, -2 ) ) {
 264                  // Looks like a normal shortcode.
 265                  _wptexturize_pushpop_element( $curl, $no_texturize_shortcodes_stack, $no_texturize_shortcodes );
 266              } else {
 267                  // Looks like an escaped shortcode.
 268                  continue;
 269              }
 270          } elseif ( empty( $no_texturize_shortcodes_stack ) && empty( $no_texturize_tags_stack ) ) {
 271              // This is neither a delimiter, nor is this content inside of no_texturize pairs. Do texturize.
 272  
 273              $curl = str_replace( $static_characters, $static_replacements, $curl );
 274  
 275              if ( false !== strpos( $curl, "'" ) ) {
 276                  $curl = preg_replace( $dynamic_characters['apos'], $dynamic_replacements['apos'], $curl );
 277                  $curl = wptexturize_primes( $curl, "'", $prime, $open_sq_flag, $closing_single_quote );
 278                  $curl = str_replace( $apos_flag, $apos, $curl );
 279                  $curl = str_replace( $open_sq_flag, $opening_single_quote, $curl );
 280              }
 281              if ( false !== strpos( $curl, '"' ) ) {
 282                  $curl = preg_replace( $dynamic_characters['quote'], $dynamic_replacements['quote'], $curl );
 283                  $curl = wptexturize_primes( $curl, '"', $double_prime, $open_q_flag, $closing_quote );
 284                  $curl = str_replace( $open_q_flag, $opening_quote, $curl );
 285              }
 286              if ( false !== strpos( $curl, '-' ) ) {
 287                  $curl = preg_replace( $dynamic_characters['dash'], $dynamic_replacements['dash'], $curl );
 288              }
 289  
 290              // 9x9 (times), but never 0x9999.
 291              if ( 1 === preg_match( '/(?<=\d)x\d/', $curl ) ) {
 292                  // Searching for a digit is 10 times more expensive than for the x, so we avoid doing this one!
 293                  $curl = preg_replace( '/\b(\d(?(?<=0)[\d\.,]+|[\d\.,]*))x(\d[\d\.,]*)\b/', '$1&#215;$2', $curl );
 294              }
 295  
 296              // Replace each & with &#038; unless it already looks like an entity.
 297              $curl = preg_replace( '/&(?!#(?:\d+|x[a-f0-9]+);|[a-z1-4]{1,8};)/i', '&#038;', $curl );
 298          }
 299      }
 300  
 301      return implode( '', $textarr );
 302  }
 303  
 304  /**
 305   * Implements a logic tree to determine whether or not "7'." represents seven feet,
 306   * then converts the special char into either a prime char or a closing quote char.
 307   *
 308   * @since 4.3.0
 309   *
 310   * @param string $haystack    The plain text to be searched.
 311   * @param string $needle      The character to search for such as ' or ".
 312   * @param string $prime       The prime char to use for replacement.
 313   * @param string $open_quote  The opening quote char. Opening quote replacement must be
 314   *                            accomplished already.
 315   * @param string $close_quote The closing quote char to use for replacement.
 316   * @return string The $haystack value after primes and quotes replacements.
 317   */
 318  function wptexturize_primes( $haystack, $needle, $prime, $open_quote, $close_quote ) {
 319      $spaces           = wp_spaces_regexp();
 320      $flag             = '<!--wp-prime-or-quote-->';
 321      $quote_pattern    = "/$needle(?=\\Z|[.,:;!?)}\\-\\]]|&gt;|" . $spaces . ')/';
 322      $prime_pattern    = "/(?<=\\d)$needle/";
 323      $flag_after_digit = "/(?<=\\d)$flag/";
 324      $flag_no_digit    = "/(?<!\\d)$flag/";
 325  
 326      $sentences = explode( $open_quote, $haystack );
 327  
 328      foreach ( $sentences as $key => &$sentence ) {
 329          if ( false === strpos( $sentence, $needle ) ) {
 330              continue;
 331          } elseif ( 0 !== $key && 0 === substr_count( $sentence, $close_quote ) ) {
 332              $sentence = preg_replace( $quote_pattern, $flag, $sentence, -1, $count );
 333              if ( $count > 1 ) {
 334                  // This sentence appears to have multiple closing quotes. Attempt Vulcan logic.
 335                  $sentence = preg_replace( $flag_no_digit, $close_quote, $sentence, -1, $count2 );
 336                  if ( 0 === $count2 ) {
 337                      // Try looking for a quote followed by a period.
 338                      $count2 = substr_count( $sentence, "$flag." );
 339                      if ( $count2 > 0 ) {
 340                          // Assume the rightmost quote-period match is the end of quotation.
 341                          $pos = strrpos( $sentence, "$flag." );
 342                      } else {
 343                          // When all else fails, make the rightmost candidate a closing quote.
 344                          // This is most likely to be problematic in the context of bug #18549.
 345                          $pos = strrpos( $sentence, $flag );
 346                      }
 347                      $sentence = substr_replace( $sentence, $close_quote, $pos, strlen( $flag ) );
 348                  }
 349                  // Use conventional replacement on any remaining primes and quotes.
 350                  $sentence = preg_replace( $prime_pattern, $prime, $sentence );
 351                  $sentence = preg_replace( $flag_after_digit, $prime, $sentence );
 352                  $sentence = str_replace( $flag, $close_quote, $sentence );
 353              } elseif ( 1 == $count ) {
 354                  // Found only one closing quote candidate, so give it priority over primes.
 355                  $sentence = str_replace( $flag, $close_quote, $sentence );
 356                  $sentence = preg_replace( $prime_pattern, $prime, $sentence );
 357              } else {
 358                  // No closing quotes found. Just run primes pattern.
 359                  $sentence = preg_replace( $prime_pattern, $prime, $sentence );
 360              }
 361          } else {
 362              $sentence = preg_replace( $prime_pattern, $prime, $sentence );
 363              $sentence = preg_replace( $quote_pattern, $close_quote, $sentence );
 364          }
 365          if ( '"' === $needle && false !== strpos( $sentence, '"' ) ) {
 366              $sentence = str_replace( '"', $close_quote, $sentence );
 367          }
 368      }
 369  
 370      return implode( $open_quote, $sentences );
 371  }
 372  
 373  /**
 374   * Search for disabled element tags. Push element to stack on tag open and pop
 375   * on tag close.
 376   *
 377   * Assumes first char of $text is tag opening and last char is tag closing.
 378   * Assumes second char of $text is optionally '/' to indicate closing as in </html>.
 379   *
 380   * @since 2.9.0
 381   * @access private
 382   *
 383   * @param string   $text              Text to check. Must be a tag like `<html>` or `[shortcode]`.
 384   * @param string[] $stack             Array of open tag elements.
 385   * @param string[] $disabled_elements Array of tag names to match against. Spaces are not allowed in tag names.
 386   */
 387  function _wptexturize_pushpop_element( $text, &$stack, $disabled_elements ) {
 388      // Is it an opening tag or closing tag?
 389      if ( isset( $text[1] ) && '/' !== $text[1] ) {
 390          $opening_tag = true;
 391          $name_offset = 1;
 392      } elseif ( 0 === count( $stack ) ) {
 393          // Stack is empty. Just stop.
 394          return;
 395      } else {
 396          $opening_tag = false;
 397          $name_offset = 2;
 398      }
 399  
 400      // Parse out the tag name.
 401      $space = strpos( $text, ' ' );
 402      if ( false === $space ) {
 403          $space = -1;
 404      } else {
 405          $space -= $name_offset;
 406      }
 407      $tag = substr( $text, $name_offset, $space );
 408  
 409      // Handle disabled tags.
 410      if ( in_array( $tag, $disabled_elements, true ) ) {
 411          if ( $opening_tag ) {
 412              /*
 413               * This disables texturize until we find a closing tag of our type
 414               * (e.g. <pre>) even if there was invalid nesting before that.
 415               *
 416               * Example: in the case <pre>sadsadasd</code>"baba"</pre>
 417               *          "baba" won't be texturized.
 418               */
 419  
 420              array_push( $stack, $tag );
 421          } elseif ( end( $stack ) == $tag ) {
 422              array_pop( $stack );
 423          }
 424      }
 425  }
 426  
 427  /**
 428   * Replaces double line breaks with paragraph elements.
 429   *
 430   * A group of regex replaces used to identify text formatted with newlines and
 431   * replace double line breaks with HTML paragraph tags. The remaining line breaks
 432   * after conversion become <<br />> tags, unless $br is set to '0' or 'false'.
 433   *
 434   * @since 0.71
 435   *
 436   * @param string $pee The text which has to be formatted.
 437   * @param bool   $br  Optional. If set, this will convert all remaining line breaks
 438   *                    after paragraphing. Line breaks within `<script>`, `<style>`,
 439   *                    and `<svg>` tags are not affected. Default true.
 440   * @return string Text which has been converted into correct paragraph tags.
 441   */
 442  function wpautop( $pee, $br = true ) {
 443      $pre_tags = array();
 444  
 445      if ( trim( $pee ) === '' ) {
 446          return '';
 447      }
 448  
 449      // Just to make things a little easier, pad the end.
 450      $pee = $pee . "\n";
 451  
 452      /*
 453       * Pre tags shouldn't be touched by autop.
 454       * Replace pre tags with placeholders and bring them back after autop.
 455       */
 456      if ( strpos( $pee, '<pre' ) !== false ) {
 457          $pee_parts = explode( '</pre>', $pee );
 458          $last_pee  = array_pop( $pee_parts );
 459          $pee       = '';
 460          $i         = 0;
 461  
 462          foreach ( $pee_parts as $pee_part ) {
 463              $start = strpos( $pee_part, '<pre' );
 464  
 465              // Malformed HTML?
 466              if ( false === $start ) {
 467                  $pee .= $pee_part;
 468                  continue;
 469              }
 470  
 471              $name              = "<pre wp-pre-tag-$i></pre>";
 472              $pre_tags[ $name ] = substr( $pee_part, $start ) . '</pre>';
 473  
 474              $pee .= substr( $pee_part, 0, $start ) . $name;
 475              $i++;
 476          }
 477  
 478          $pee .= $last_pee;
 479      }
 480      // Change multiple <br>'s into two line breaks, which will turn into paragraphs.
 481      $pee = preg_replace( '|<br\s*/?>\s*<br\s*/?>|', "\n\n", $pee );
 482  
 483      $allblocks = '(?:table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|form|map|area|blockquote|address|math|style|p|h[1-6]|hr|fieldset|legend|section|article|aside|hgroup|header|footer|nav|figure|figcaption|details|menu|summary)';
 484  
 485      // Add a double line break above block-level opening tags.
 486      $pee = preg_replace( '!(<' . $allblocks . '[\s/>])!', "\n\n$1", $pee );
 487  
 488      // Add a double line break below block-level closing tags.
 489      $pee = preg_replace( '!(</' . $allblocks . '>)!', "$1\n\n", $pee );
 490  
 491      // Add a double line break after hr tags, which are self closing.
 492      $pee = preg_replace( '!(<hr\s*?/?>)!', "$1\n\n", $pee );
 493  
 494      // Standardize newline characters to "\n".
 495      $pee = str_replace( array( "\r\n", "\r" ), "\n", $pee );
 496  
 497      // Find newlines in all elements and add placeholders.
 498      $pee = wp_replace_in_html_tags( $pee, array( "\n" => ' <!-- wpnl --> ' ) );
 499  
 500      // Collapse line breaks before and after <option> elements so they don't get autop'd.
 501      if ( strpos( $pee, '<option' ) !== false ) {
 502          $pee = preg_replace( '|\s*<option|', '<option', $pee );
 503          $pee = preg_replace( '|</option>\s*|', '</option>', $pee );
 504      }
 505  
 506      /*
 507       * Collapse line breaks inside <object> elements, before <param> and <embed> elements
 508       * so they don't get autop'd.
 509       */
 510      if ( strpos( $pee, '</object>' ) !== false ) {
 511          $pee = preg_replace( '|(<object[^>]*>)\s*|', '$1', $pee );
 512          $pee = preg_replace( '|\s*</object>|', '</object>', $pee );
 513          $pee = preg_replace( '%\s*(</?(?:param|embed)[^>]*>)\s*%', '$1', $pee );
 514      }
 515  
 516      /*
 517       * Collapse line breaks inside <audio> and <video> elements,
 518       * before and after <source> and <track> elements.
 519       */
 520      if ( strpos( $pee, '<source' ) !== false || strpos( $pee, '<track' ) !== false ) {
 521          $pee = preg_replace( '%([<\[](?:audio|video)[^>\]]*[>\]])\s*%', '$1', $pee );
 522          $pee = preg_replace( '%\s*([<\[]/(?:audio|video)[>\]])%', '$1', $pee );
 523          $pee = preg_replace( '%\s*(<(?:source|track)[^>]*>)\s*%', '$1', $pee );
 524      }
 525  
 526      // Collapse line breaks before and after <figcaption> elements.
 527      if ( strpos( $pee, '<figcaption' ) !== false ) {
 528          $pee = preg_replace( '|\s*(<figcaption[^>]*>)|', '$1', $pee );
 529          $pee = preg_replace( '|</figcaption>\s*|', '</figcaption>', $pee );
 530      }
 531  
 532      // Remove more than two contiguous line breaks.
 533      $pee = preg_replace( "/\n\n+/", "\n\n", $pee );
 534  
 535      // Split up the contents into an array of strings, separated by double line breaks.
 536      $pees = preg_split( '/\n\s*\n/', $pee, -1, PREG_SPLIT_NO_EMPTY );
 537  
 538      // Reset $pee prior to rebuilding.
 539      $pee = '';
 540  
 541      // Rebuild the content as a string, wrapping every bit with a <p>.
 542      foreach ( $pees as $tinkle ) {
 543          $pee .= '<p>' . trim( $tinkle, "\n" ) . "</p>\n";
 544      }
 545  
 546      // Under certain strange conditions it could create a P of entirely whitespace.
 547      $pee = preg_replace( '|<p>\s*</p>|', '', $pee );
 548  
 549      // Add a closing <p> inside <div>, <address>, or <form> tag if missing.
 550      $pee = preg_replace( '!<p>([^<]+)</(div|address|form)>!', '<p>$1</p></$2>', $pee );
 551  
 552      // If an opening or closing block element tag is wrapped in a <p>, unwrap it.
 553      $pee = preg_replace( '!<p>\s*(</?' . $allblocks . '[^>]*>)\s*</p>!', '$1', $pee );
 554  
 555      // In some cases <li> may get wrapped in <p>, fix them.
 556      $pee = preg_replace( '|<p>(<li.+?)</p>|', '$1', $pee );
 557  
 558      // If a <blockquote> is wrapped with a <p>, move it inside the <blockquote>.
 559      $pee = preg_replace( '|<p><blockquote([^>]*)>|i', '<blockquote$1><p>', $pee );
 560      $pee = str_replace( '</blockquote></p>', '</p></blockquote>', $pee );
 561  
 562      // If an opening or closing block element tag is preceded by an opening <p> tag, remove it.
 563      $pee = preg_replace( '!<p>\s*(</?' . $allblocks . '[^>]*>)!', '$1', $pee );
 564  
 565      // If an opening or closing block element tag is followed by a closing <p> tag, remove it.
 566      $pee = preg_replace( '!(</?' . $allblocks . '[^>]*>)\s*</p>!', '$1', $pee );
 567  
 568      // Optionally insert line breaks.
 569      if ( $br ) {
 570          // Replace newlines that shouldn't be touched with a placeholder.
 571          $pee = preg_replace_callback( '/<(script|style|svg).*?<\/\\1>/s', '_autop_newline_preservation_helper', $pee );
 572  
 573          // Normalize <br>
 574          $pee = str_replace( array( '<br>', '<br/>' ), '<br />', $pee );
 575  
 576          // Replace any new line characters that aren't preceded by a <br /> with a <br />.
 577          $pee = preg_replace( '|(?<!<br />)\s*\n|', "<br />\n", $pee );
 578  
 579          // Replace newline placeholders with newlines.
 580          $pee = str_replace( '<WPPreserveNewline />', "\n", $pee );
 581      }
 582  
 583      // If a <br /> tag is after an opening or closing block tag, remove it.
 584      $pee = preg_replace( '!(</?' . $allblocks . '[^>]*>)\s*<br />!', '$1', $pee );
 585  
 586      // If a <br /> tag is before a subset of opening or closing block tags, remove it.
 587      $pee = preg_replace( '!<br />(\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)[^>]*>)!', '$1', $pee );
 588      $pee = preg_replace( "|\n</p>$|", '</p>', $pee );
 589  
 590      // Replace placeholder <pre> tags with their original content.
 591      if ( ! empty( $pre_tags ) ) {
 592          $pee = str_replace( array_keys( $pre_tags ), array_values( $pre_tags ), $pee );
 593      }
 594  
 595      // Restore newlines in all elements.
 596      if ( false !== strpos( $pee, '<!-- wpnl -->' ) ) {
 597          $pee = str_replace( array( ' <!-- wpnl --> ', '<!-- wpnl -->' ), "\n", $pee );
 598      }
 599  
 600      return $pee;
 601  }
 602  
 603  /**
 604   * Separate HTML elements and comments from the text.
 605   *
 606   * @since 4.2.4
 607   *
 608   * @param string $input The text which has to be formatted.
 609   * @return string[] Array of the formatted text.
 610   */
 611  function wp_html_split( $input ) {
 612      return preg_split( get_html_split_regex(), $input, -1, PREG_SPLIT_DELIM_CAPTURE );
 613  }
 614  
 615  /**
 616   * Retrieve the regular expression for an HTML element.
 617   *
 618   * @since 4.4.0
 619   *
 620   * @return string The regular expression
 621   */
 622  function get_html_split_regex() {
 623      static $regex;
 624  
 625      if ( ! isset( $regex ) ) {
 626          // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
 627          $comments =
 628              '!'             // Start of comment, after the <.
 629              . '(?:'         // Unroll the loop: Consume everything until --> is found.
 630              .     '-(?!->)' // Dash not followed by end of comment.
 631              .     '[^\-]*+' // Consume non-dashes.
 632              . ')*+'         // Loop possessively.
 633              . '(?:-->)?';   // End of comment. If not found, match all input.
 634  
 635          $cdata =
 636              '!\[CDATA\['    // Start of comment, after the <.
 637              . '[^\]]*+'     // Consume non-].
 638              . '(?:'         // Unroll the loop: Consume everything until ]]> is found.
 639              .     '](?!]>)' // One ] not followed by end of comment.
 640              .     '[^\]]*+' // Consume non-].
 641              . ')*+'         // Loop possessively.
 642              . '(?:]]>)?';   // End of comment. If not found, match all input.
 643  
 644          $escaped =
 645              '(?='             // Is the element escaped?
 646              .    '!--'
 647              . '|'
 648              .    '!\[CDATA\['
 649              . ')'
 650              . '(?(?=!-)'      // If yes, which type?
 651              .     $comments
 652              . '|'
 653              .     $cdata
 654              . ')';
 655  
 656          $regex =
 657              '/('                // Capture the entire match.
 658              .     '<'           // Find start of element.
 659              .     '(?'          // Conditional expression follows.
 660              .         $escaped  // Find end of escaped element.
 661              .     '|'           // ...else...
 662              .         '[^>]*>?' // Find end of normal element.
 663              .     ')'
 664              . ')/';
 665          // phpcs:enable
 666      }
 667  
 668      return $regex;
 669  }
 670  
 671  /**
 672   * Retrieve the combined regular expression for HTML and shortcodes.
 673   *
 674   * @access private
 675   * @ignore
 676   * @internal This function will be removed in 4.5.0 per Shortcode API Roadmap.
 677   * @since 4.4.0
 678   *
 679   * @param string $shortcode_regex The result from _get_wptexturize_shortcode_regex(). Optional.
 680   * @return string The regular expression
 681   */
 682  function _get_wptexturize_split_regex( $shortcode_regex = '' ) {
 683      static $html_regex;
 684  
 685      if ( ! isset( $html_regex ) ) {
 686          // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
 687          $comment_regex =
 688              '!'             // Start of comment, after the <.
 689              . '(?:'         // Unroll the loop: Consume everything until --> is found.
 690              .     '-(?!->)' // Dash not followed by end of comment.
 691              .     '[^\-]*+' // Consume non-dashes.
 692              . ')*+'         // Loop possessively.
 693              . '(?:-->)?';   // End of comment. If not found, match all input.
 694  
 695          $html_regex = // Needs replaced with wp_html_split() per Shortcode API Roadmap.
 696              '<'                  // Find start of element.
 697              . '(?(?=!--)'        // Is this a comment?
 698              .     $comment_regex // Find end of comment.
 699              . '|'
 700              .     '[^>]*>?'      // Find end of element. If not found, match all input.
 701              . ')';
 702          // phpcs:enable
 703      }
 704  
 705      if ( empty( $shortcode_regex ) ) {
 706          $regex = '/(' . $html_regex . ')/';
 707      } else {
 708          $regex = '/(' . $html_regex . '|' . $shortcode_regex . ')/';
 709      }
 710  
 711      return $regex;
 712  }
 713  
 714  /**
 715   * Retrieve the regular expression for shortcodes.
 716   *
 717   * @access private
 718   * @ignore
 719   * @since 4.4.0
 720   *
 721   * @param string[] $tagnames Array of shortcodes to find.
 722   * @return string The regular expression
 723   */
 724  function _get_wptexturize_shortcode_regex( $tagnames ) {
 725      $tagregexp = join( '|', array_map( 'preg_quote', $tagnames ) );
 726      $tagregexp = "(?:$tagregexp)(?=[\\s\\]\\/])"; // Excerpt of get_shortcode_regex().
 727      // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
 728      $regex =
 729          '\['                // Find start of shortcode.
 730          . '[\/\[]?'         // Shortcodes may begin with [/ or [[.
 731          . $tagregexp        // Only match registered shortcodes, because performance.
 732          . '(?:'
 733          .     '[^\[\]<>]+'  // Shortcodes do not contain other shortcodes. Quantifier critical.
 734          . '|'
 735          .     '<[^\[\]>]*>' // HTML elements permitted. Prevents matching ] before >.
 736          . ')*+'             // Possessive critical.
 737          . '\]'              // Find end of shortcode.
 738          . '\]?';            // Shortcodes may end with ]].
 739      // phpcs:enable
 740  
 741      return $regex;
 742  }
 743  
 744  /**
 745   * Replace characters or phrases within HTML elements only.
 746   *
 747   * @since 4.2.3
 748   *
 749   * @param string $haystack The text which has to be formatted.
 750   * @param array $replace_pairs In the form array('from' => 'to', ...).
 751   * @return string The formatted text.
 752   */
 753  function wp_replace_in_html_tags( $haystack, $replace_pairs ) {
 754      // Find all elements.
 755      $textarr = wp_html_split( $haystack );
 756      $changed = false;
 757  
 758      // Optimize when searching for one item.
 759      if ( 1 === count( $replace_pairs ) ) {
 760          // Extract $needle and $replace.
 761          foreach ( $replace_pairs as $needle => $replace ) {
 762          }
 763  
 764          // Loop through delimiters (elements) only.
 765          for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {
 766              if ( false !== strpos( $textarr[ $i ], $needle ) ) {
 767                  $textarr[ $i ] = str_replace( $needle, $replace, $textarr[ $i ] );
 768                  $changed       = true;
 769              }
 770          }
 771      } else {
 772          // Extract all $needles.
 773          $needles = array_keys( $replace_pairs );
 774  
 775          // Loop through delimiters (elements) only.
 776          for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {
 777              foreach ( $needles as $needle ) {
 778                  if ( false !== strpos( $textarr[ $i ], $needle ) ) {
 779                      $textarr[ $i ] = strtr( $textarr[ $i ], $replace_pairs );
 780                      $changed       = true;
 781                      // After one strtr() break out of the foreach loop and look at next element.
 782                      break;
 783                  }
 784              }
 785          }
 786      }
 787  
 788      if ( $changed ) {
 789          $haystack = implode( $textarr );
 790      }
 791  
 792      return $haystack;
 793  }
 794  
 795  /**
 796   * Newline preservation help function for wpautop
 797   *
 798   * @since 3.1.0
 799   * @access private
 800   *
 801   * @param array $matches preg_replace_callback matches array
 802   * @return string
 803   */
 804  function _autop_newline_preservation_helper( $matches ) {
 805      return str_replace( "\n", '<WPPreserveNewline />', $matches[0] );
 806  }
 807  
 808  /**
 809   * Don't auto-p wrap shortcodes that stand alone
 810   *
 811   * Ensures that shortcodes are not wrapped in `<p>...</p>`.
 812   *
 813   * @since 2.9.0
 814   *
 815   * @global array $shortcode_tags
 816   *
 817   * @param string $pee The content.
 818   * @return string The filtered content.
 819   */
 820  function shortcode_unautop( $pee ) {
 821      global $shortcode_tags;
 822  
 823      if ( empty( $shortcode_tags ) || ! is_array( $shortcode_tags ) ) {
 824          return $pee;
 825      }
 826  
 827      $tagregexp = join( '|', array_map( 'preg_quote', array_keys( $shortcode_tags ) ) );
 828      $spaces    = wp_spaces_regexp();
 829  
 830      // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound,WordPress.WhiteSpace.PrecisionAlignment.Found -- don't remove regex indentation
 831      $pattern =
 832          '/'
 833          . '<p>'                              // Opening paragraph.
 834          . '(?:' . $spaces . ')*+'            // Optional leading whitespace.
 835          . '('                                // 1: The shortcode.
 836          .     '\\['                          // Opening bracket.
 837          .     "($tagregexp)"                 // 2: Shortcode name.
 838          .     '(?![\\w-])'                   // Not followed by word character or hyphen.
 839                                               // Unroll the loop: Inside the opening shortcode tag.
 840          .     '[^\\]\\/]*'                   // Not a closing bracket or forward slash.
 841          .     '(?:'
 842          .         '\\/(?!\\])'               // A forward slash not followed by a closing bracket.
 843          .         '[^\\]\\/]*'               // Not a closing bracket or forward slash.
 844          .     ')*?'
 845          .     '(?:'
 846          .         '\\/\\]'                   // Self closing tag and closing bracket.
 847          .     '|'
 848          .         '\\]'                      // Closing bracket.
 849          .         '(?:'                      // Unroll the loop: Optionally, anything between the opening and closing shortcode tags.
 850          .             '[^\\[]*+'             // Not an opening bracket.
 851          .             '(?:'
 852          .                 '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag.
 853          .                 '[^\\[]*+'         // Not an opening bracket.
 854          .             ')*+'
 855          .             '\\[\\/\\2\\]'         // Closing shortcode tag.
 856          .         ')?'
 857          .     ')'
 858          . ')'
 859          . '(?:' . $spaces . ')*+'            // Optional trailing whitespace.
 860          . '<\\/p>'                           // Closing paragraph.
 861          . '/';
 862      // phpcs:enable
 863  
 864      return preg_replace( $pattern, '$1', $pee );
 865  }
 866  
 867  /**
 868   * Checks to see if a string is utf8 encoded.
 869   *
 870   * NOTE: This function checks for 5-Byte sequences, UTF8
 871   *       has Bytes Sequences with a maximum length of 4.
 872   *
 873   * @author bmorel at ssi dot fr (modified)
 874   * @since 1.2.1
 875   *
 876   * @param string $str The string to be checked
 877   * @return bool True if $str fits a UTF-8 model, false otherwise.
 878   */
 879  function seems_utf8( $str ) {
 880      mbstring_binary_safe_encoding();
 881      $length = strlen( $str );
 882      reset_mbstring_encoding();
 883      for ( $i = 0; $i < $length; $i++ ) {
 884          $c = ord( $str[ $i ] );
 885          if ( $c < 0x80 ) {
 886              $n = 0; // 0bbbbbbb
 887          } elseif ( ( $c & 0xE0 ) == 0xC0 ) {
 888              $n = 1; // 110bbbbb
 889          } elseif ( ( $c & 0xF0 ) == 0xE0 ) {
 890              $n = 2; // 1110bbbb
 891          } elseif ( ( $c & 0xF8 ) == 0xF0 ) {
 892              $n = 3; // 11110bbb
 893          } elseif ( ( $c & 0xFC ) == 0xF8 ) {
 894              $n = 4; // 111110bb
 895          } elseif ( ( $c & 0xFE ) == 0xFC ) {
 896              $n = 5; // 1111110b
 897          } else {
 898              return false; // Does not match any model.
 899          }
 900          for ( $j = 0; $j < $n; $j++ ) { // n bytes matching 10bbbbbb follow ?
 901              if ( ( ++$i == $length ) || ( ( ord( $str[ $i ] ) & 0xC0 ) != 0x80 ) ) {
 902                  return false;
 903              }
 904          }
 905      }
 906      return true;
 907  }
 908  
 909  /**
 910   * Converts a number of special characters into their HTML entities.
 911   *
 912   * Specifically deals with: &, <, >, ", and '.
 913   *
 914   * $quote_style can be set to ENT_COMPAT to encode " to
 915   * &quot;, or ENT_QUOTES to do both. Default is ENT_NOQUOTES where no quotes are encoded.
 916   *
 917   * @since 1.2.2
 918   * @since 5.5.0 `$quote_style` also accepts `ENT_XML1`.
 919   * @access private
 920   *
 921   * @param string       $string        The text which is to be encoded.
 922   * @param int|string   $quote_style   Optional. Converts double quotes if set to ENT_COMPAT,
 923   *                                    both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES.
 924   *                                    Converts single and double quotes, as well as converting HTML
 925   *                                    named entities (that are not also XML named entities) to their
 926   *                                    code points if set to ENT_XML1. Also compatible with old values;
 927   *                                    converting single quotes if set to 'single',
 928   *                                    double if set to 'double' or both if otherwise set.
 929   *                                    Default is ENT_NOQUOTES.
 930   * @param false|string $charset       Optional. The character encoding of the string. Default false.
 931   * @param bool         $double_encode Optional. Whether to encode existing HTML entities. Default false.
 932   * @return string The encoded text with HTML entities.
 933   */
 934  function _wp_specialchars( $string, $quote_style = ENT_NOQUOTES, $charset = false, $double_encode = false ) {
 935      $string = (string) $string;
 936  
 937      if ( 0 === strlen( $string ) ) {
 938          return '';
 939      }
 940  
 941      // Don't bother if there are no specialchars - saves some processing.
 942      if ( ! preg_match( '/[&<>"\']/', $string ) ) {
 943          return $string;
 944      }
 945  
 946      // Account for the previous behaviour of the function when the $quote_style is not an accepted value.
 947      if ( empty( $quote_style ) ) {
 948          $quote_style = ENT_NOQUOTES;
 949      } elseif ( ENT_XML1 === $quote_style ) {
 950          $quote_style = ENT_QUOTES | ENT_XML1;
 951      } elseif ( ! in_array( $quote_style, array( ENT_NOQUOTES, ENT_COMPAT, ENT_QUOTES, 'single', 'double' ), true ) ) {
 952          $quote_style = ENT_QUOTES;
 953      }
 954  
 955      // Store the site charset as a static to avoid multiple calls to wp_load_alloptions().
 956      if ( ! $charset ) {
 957          static $_charset = null;
 958          if ( ! isset( $_charset ) ) {
 959              $alloptions = wp_load_alloptions();
 960              $_charset   = isset( $alloptions['blog_charset'] ) ? $alloptions['blog_charset'] : '';
 961          }
 962          $charset = $_charset;
 963      }
 964  
 965      if ( in_array( $charset, array( 'utf8', 'utf-8', 'UTF8' ), true ) ) {
 966          $charset = 'UTF-8';
 967      }
 968  
 969      $_quote_style = $quote_style;
 970  
 971      if ( 'double' === $quote_style ) {
 972          $quote_style  = ENT_COMPAT;
 973          $_quote_style = ENT_COMPAT;
 974      } elseif ( 'single' === $quote_style ) {
 975          $quote_style = ENT_NOQUOTES;
 976      }
 977  
 978      if ( ! $double_encode ) {
 979          // Guarantee every &entity; is valid, convert &garbage; into &amp;garbage;
 980          // This is required for PHP < 5.4.0 because ENT_HTML401 flag is unavailable.
 981          $string = wp_kses_normalize_entities( $string, ( $quote_style & ENT_XML1 ) ? 'xml' : 'html' );
 982      }
 983  
 984      $string = htmlspecialchars( $string, $quote_style, $charset, $double_encode );
 985  
 986      // Back-compat.
 987      if ( 'single' === $_quote_style ) {
 988          $string = str_replace( "'", '&#039;', $string );
 989      }
 990  
 991      return $string;
 992  }
 993  
 994  /**
 995   * Converts a number of HTML entities into their special characters.
 996   *
 997   * Specifically deals with: &, <, >, ", and '.
 998   *
 999   * $quote_style can be set to ENT_COMPAT to decode " entities,
1000   * or ENT_QUOTES to do both " and '. Default is ENT_NOQUOTES where no quotes are decoded.
1001   *
1002   * @since 2.8.0
1003   *
1004   * @param string     $string The text which is to be decoded.
1005   * @param string|int $quote_style Optional. Converts double quotes if set to ENT_COMPAT,
1006   *                                both single and double if set to ENT_QUOTES or
1007   *                                none if set to ENT_NOQUOTES.
1008   *                                Also compatible with old _wp_specialchars() values;
1009   *                                converting single quotes if set to 'single',
1010   *                                double if set to 'double' or both if otherwise set.
1011   *                                Default is ENT_NOQUOTES.
1012   * @return string The decoded text without HTML entities.
1013   */
1014  function wp_specialchars_decode( $string, $quote_style = ENT_NOQUOTES ) {
1015      $string = (string) $string;
1016  
1017      if ( 0 === strlen( $string ) ) {
1018          return '';
1019      }
1020  
1021      // Don't bother if there are no entities - saves a lot of processing.
1022      if ( strpos( $string, '&' ) === false ) {
1023          return $string;
1024      }
1025  
1026      // Match the previous behaviour of _wp_specialchars() when the $quote_style is not an accepted value.
1027      if ( empty( $quote_style ) ) {
1028          $quote_style = ENT_NOQUOTES;
1029      } elseif ( ! in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) ) {
1030          $quote_style = ENT_QUOTES;
1031      }
1032  
1033      // More complete than get_html_translation_table( HTML_SPECIALCHARS ).
1034      $single      = array(
1035          '&#039;' => '\'',
1036          '&#x27;' => '\'',
1037      );
1038      $single_preg = array(
1039          '/&#0*39;/'   => '&#039;',
1040          '/&#x0*27;/i' => '&#x27;',
1041      );
1042      $double      = array(
1043          '&quot;' => '"',
1044          '&#034;' => '"',
1045          '&#x22;' => '"',
1046      );
1047      $double_preg = array(
1048          '/&#0*34;/'   => '&#034;',
1049          '/&#x0*22;/i' => '&#x22;',
1050      );
1051      $others      = array(
1052          '&lt;'   => '<',
1053          '&#060;' => '<',
1054          '&gt;'   => '>',
1055          '&#062;' => '>',
1056          '&amp;'  => '&',
1057          '&#038;' => '&',
1058          '&#x26;' => '&',
1059      );
1060      $others_preg = array(
1061          '/&#0*60;/'   => '&#060;',
1062          '/&#0*62;/'   => '&#062;',
1063          '/&#0*38;/'   => '&#038;',
1064          '/&#x0*26;/i' => '&#x26;',
1065      );
1066  
1067      if ( ENT_QUOTES === $quote_style ) {
1068          $translation      = array_merge( $single, $double, $others );
1069          $translation_preg = array_merge( $single_preg, $double_preg, $others_preg );
1070      } elseif ( ENT_COMPAT === $quote_style || 'double' === $quote_style ) {
1071          $translation      = array_merge( $double, $others );
1072          $translation_preg = array_merge( $double_preg, $others_preg );
1073      } elseif ( 'single' === $quote_style ) {
1074          $translation      = array_merge( $single, $others );
1075          $translation_preg = array_merge( $single_preg, $others_preg );
1076      } elseif ( ENT_NOQUOTES === $quote_style ) {
1077          $translation      = $others;
1078          $translation_preg = $others_preg;
1079      }
1080  
1081      // Remove zero padding on numeric entities.
1082      $string = preg_replace( array_keys( $translation_preg ), array_values( $translation_preg ), $string );
1083  
1084      // Replace characters according to translation table.
1085      return strtr( $string, $translation );
1086  }
1087  
1088  /**
1089   * Checks for invalid UTF8 in a string.
1090   *
1091   * @since 2.8.0
1092   *
1093   * @param string  $string The text which is to be checked.
1094   * @param bool    $strip  Optional. Whether to attempt to strip out invalid UTF8. Default false.
1095   * @return string The checked text.
1096   */
1097  function wp_check_invalid_utf8( $string, $strip = false ) {
1098      $string = (string) $string;
1099  
1100      if ( 0 === strlen( $string ) ) {
1101          return '';
1102      }
1103  
1104      // Store the site charset as a static to avoid multiple calls to get_option().
1105      static $is_utf8 = null;
1106      if ( ! isset( $is_utf8 ) ) {
1107          $is_utf8 = in_array( get_option( 'blog_charset' ), array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ), true );
1108      }
1109      if ( ! $is_utf8 ) {
1110          return $string;
1111      }
1112  
1113      // Check for support for utf8 in the installed PCRE library once and store the result in a static.
1114      static $utf8_pcre = null;
1115      if ( ! isset( $utf8_pcre ) ) {
1116          // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
1117          $utf8_pcre = @preg_match( '/^./u', 'a' );
1118      }
1119      // We can't demand utf8 in the PCRE installation, so just return the string in those cases.
1120      if ( ! $utf8_pcre ) {
1121          return $string;
1122      }
1123  
1124      // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- preg_match fails when it encounters invalid UTF8 in $string.
1125      if ( 1 === @preg_match( '/^./us', $string ) ) {
1126          return $string;
1127      }
1128  
1129      // Attempt to strip the bad chars if requested (not recommended).
1130      if ( $strip && function_exists( 'iconv' ) ) {
1131          return iconv( 'utf-8', 'utf-8', $string );
1132      }
1133  
1134      return '';
1135  }
1136  
1137  /**
1138   * Encode the Unicode values to be used in the URI.
1139   *
1140   * @since 1.5.0
1141   *
1142   * @param string $utf8_string
1143   * @param int    $length Max  length of the string
1144   * @return string String with Unicode encoded for URI.
1145   */
1146  function utf8_uri_encode( $utf8_string, $length = 0 ) {
1147      $unicode        = '';
1148      $values         = array();
1149      $num_octets     = 1;
1150      $unicode_length = 0;
1151  
1152      mbstring_binary_safe_encoding();
1153      $string_length = strlen( $utf8_string );
1154      reset_mbstring_encoding();
1155  
1156      for ( $i = 0; $i < $string_length; $i++ ) {
1157  
1158          $value = ord( $utf8_string[ $i ] );
1159  
1160          if ( $value < 128 ) {
1161              if ( $length && ( $unicode_length >= $length ) ) {
1162                  break;
1163              }
1164              $unicode .= chr( $value );
1165              $unicode_length++;
1166          } else {
1167              if ( count( $values ) == 0 ) {
1168                  if ( $value < 224 ) {
1169                      $num_octets = 2;
1170                  } elseif ( $value < 240 ) {
1171                      $num_octets = 3;
1172                  } else {
1173                      $num_octets = 4;
1174                  }
1175              }
1176  
1177              $values[] = $value;
1178  
1179              if ( $length && ( $unicode_length + ( $num_octets * 3 ) ) > $length ) {
1180                  break;
1181              }
1182              if ( count( $values ) == $num_octets ) {
1183                  for ( $j = 0; $j < $num_octets; $j++ ) {
1184                      $unicode .= '%' . dechex( $values[ $j ] );
1185                  }
1186  
1187                  $unicode_length += $num_octets * 3;
1188  
1189                  $values     = array();
1190                  $num_octets = 1;
1191              }
1192          }
1193      }
1194  
1195      return $unicode;
1196  }
1197  
1198  /**
1199   * Converts all accent characters to ASCII characters.
1200   *
1201   * If there are no accent characters, then the string given is just returned.
1202   *
1203   * **Accent characters converted:**
1204   *
1205   * Currency signs:
1206   *
1207   * |   Code   | Glyph | Replacement |     Description     |
1208   * | -------- | ----- | ----------- | ------------------- |
1209   * | U+00A3   | £     | (empty)     | British Pound sign  |
1210   * | U+20AC   | €     | E           | Euro sign           |
1211   *
1212   * Decompositions for Latin-1 Supplement:
1213   *
1214   * |  Code   | Glyph | Replacement |               Description              |
1215   * | ------- | ----- | ----------- | -------------------------------------- |
1216   * | U+00AA  | ª     | a           | Feminine ordinal indicator             |
1217   * | U+00BA  | º     | o           | Masculine ordinal indicator            |
1218   * | U+00C0  | À     | A           | Latin capital letter A with grave      |
1219   * | U+00C1  | Á     | A           | Latin capital letter A with acute      |
1220   * | U+00C2  | Â     | A           | Latin capital letter A with circumflex |
1221   * | U+00C3  | Ã     | A           | Latin capital letter A with tilde      |
1222   * | U+00C4  | Ä     | A           | Latin capital letter A with diaeresis  |
1223   * | U+00C5  | Å     | A           | Latin capital letter A with ring above |
1224   * | U+00C6  | Æ     | AE          | Latin capital letter AE                |
1225   * | U+00C7  | Ç     | C           | Latin capital letter C with cedilla    |
1226   * | U+00C8  | È     | E           | Latin capital letter E with grave      |
1227   * | U+00C9  | É     | E           | Latin capital letter E with acute      |
1228   * | U+00CA  | Ê     | E           | Latin capital letter E with circumflex |
1229   * | U+00CB  | Ë     | E           | Latin capital letter E with diaeresis  |
1230   * | U+00CC  | Ì     | I           | Latin capital letter I with grave      |
1231   * | U+00CD  | Í     | I           | Latin capital letter I with acute      |
1232   * | U+00CE  | Î     | I           | Latin capital letter I with circumflex |
1233   * | U+00CF  | Ï     | I           | Latin capital letter I with diaeresis  |
1234   * | U+00D0  | Ð     | D           | Latin capital letter Eth               |
1235   * | U+00D1  | Ñ     | N           | Latin capital letter N with tilde      |
1236   * | U+00D2  | Ò     | O           | Latin capital letter O with grave      |
1237   * | U+00D3  | Ó     | O           | Latin capital letter O with acute      |
1238   * | U+00D4  | Ô     | O           | Latin capital letter O with circumflex |
1239   * | U+00D5  | Õ     | O           | Latin capital letter O with tilde      |
1240   * | U+00D6  | Ö     | O           | Latin capital letter O with diaeresis  |
1241   * | U+00D8  | Ø     | O           | Latin capital letter O with stroke     |
1242   * | U+00D9  | Ù     | U           | Latin capital letter U with grave      |
1243   * | U+00DA  | Ú     | U           | Latin capital letter U with acute      |
1244   * | U+00DB  | Û     | U           | Latin capital letter U with circumflex |
1245   * | U+00DC  | Ü     | U           | Latin capital letter U with diaeresis  |
1246   * | U+00DD  | Ý     | Y           | Latin capital letter Y with acute      |
1247   * | U+00DE  | Þ     | TH          | Latin capital letter Thorn             |
1248   * | U+00DF  | ß     | s           | Latin small letter sharp s             |
1249   * | U+00E0  | à     | a           | Latin small letter a with grave        |
1250   * | U+00E1  | á     | a           | Latin small letter a with acute        |
1251   * | U+00E2  | â     | a           | Latin small letter a with circumflex   |
1252   * | U+00E3  | ã     | a           | Latin small letter a with tilde        |
1253   * | U+00E4  | ä     | a           | Latin small letter a with diaeresis    |
1254   * | U+00E5  | å     | a           | Latin small letter a with ring above   |
1255   * | U+00E6  | æ     | ae          | Latin small letter ae                  |
1256   * | U+00E7  | ç     | c           | Latin small letter c with cedilla      |
1257   * | U+00E8  | è     | e           | Latin small letter e with grave        |
1258   * | U+00E9  | é     | e           | Latin small letter e with acute        |
1259   * | U+00EA  | ê     | e           | Latin small letter e with circumflex   |
1260   * | U+00EB  | ë     | e           | Latin small letter e with diaeresis    |
1261   * | U+00EC  | ì     | i           | Latin small letter i with grave        |
1262   * | U+00ED  | í     | i           | Latin small letter i with acute        |
1263   * | U+00EE  | î     | i           | Latin small letter i with circumflex   |
1264   * | U+00EF  | ï     | i           | Latin small letter i with diaeresis    |
1265   * | U+00F0  | ð     | d           | Latin small letter Eth                 |
1266   * | U+00F1  | ñ     | n           | Latin small letter n with tilde        |
1267   * | U+00F2  | ò     | o           | Latin small letter o with grave        |
1268   * | U+00F3  | ó     | o           | Latin small letter o with acute        |
1269   * | U+00F4  | ô     | o           | Latin small letter o with circumflex   |
1270   * | U+00F5  | õ     | o           | Latin small letter o with tilde        |
1271   * | U+00F6  | ö     | o           | Latin small letter o with diaeresis    |
1272   * | U+00F8  | ø     | o           | Latin small letter o with stroke       |
1273   * | U+00F9  | ù     | u           | Latin small letter u with grave        |
1274   * | U+00FA  | ú     | u           | Latin small letter u with acute        |
1275   * | U+00FB  | û     | u           | Latin small letter u with circumflex   |
1276   * | U+00FC  | ü     | u           | Latin small letter u with diaeresis    |
1277   * | U+00FD  | ý     | y           | Latin small letter y with acute        |
1278   * | U+00FE  | þ     | th          | Latin small letter Thorn               |
1279   * | U+00FF  | ÿ     | y           | Latin small letter y with diaeresis    |
1280   *
1281   * Decompositions for Latin Extended-A:
1282   *
1283   * |  Code   | Glyph | Replacement |                    Description                    |
1284   * | ------- | ----- | ----------- | ------------------------------------------------- |
1285   * | U+0100  | Ā     | A           | Latin capital letter A with macron                |
1286   * | U+0101  | ā     | a           | Latin small letter a with macron                  |
1287   * | U+0102  | Ă     | A           | Latin capital letter A with breve                 |
1288   * | U+0103  | ă     | a           | Latin small letter a with breve                   |
1289   * | U+0104  | Ą     | A           | Latin capital letter A with ogonek                |
1290   * | U+0105  | ą     | a           | Latin small letter a with ogonek                  |
1291   * | U+01006 | Ć     | C           | Latin capital letter C with acute                 |
1292   * | U+0107  | ć     | c           | Latin small letter c with acute                   |
1293   * | U+0108  | Ĉ     | C           | Latin capital letter C with circumflex            |
1294   * | U+0109  | ĉ     | c           | Latin small letter c with circumflex              |
1295   * | U+010A  | Ċ     | C           | Latin capital letter C with dot above             |
1296   * | U+010B  | ċ     | c           | Latin small letter c with dot above               |
1297   * | U+010C  | Č     | C           | Latin capital letter C with caron                 |
1298   * | U+010D  | č     | c           | Latin small letter c with caron                   |
1299   * | U+010E  | Ď     | D           | Latin capital letter D with caron                 |
1300   * | U+010F  | ď     | d           | Latin small letter d with caron                   |
1301   * | U+0110  | Đ     | D           | Latin capital letter D with stroke                |
1302   * | U+0111  | đ     | d           | Latin small letter d with stroke                  |
1303   * | U+0112  | Ē     | E           | Latin capital letter E with macron                |
1304   * | U+0113  | ē     | e           | Latin small letter e with macron                  |
1305   * | U+0114  | Ĕ     | E           | Latin capital letter E with breve                 |
1306   * | U+0115  | ĕ     | e           | Latin small letter e with breve                   |
1307   * | U+0116  | Ė     | E           | Latin capital letter E with dot above             |
1308   * | U+0117  | ė     | e           | Latin small letter e with dot above               |
1309   * | U+0118  | Ę     | E           | Latin capital letter E with ogonek                |
1310   * | U+0119  | ę     | e           | Latin small letter e with ogonek                  |
1311   * | U+011A  | Ě     | E           | Latin capital letter E with caron                 |
1312   * | U+011B  | ě     | e           | Latin small letter e with caron                   |
1313   * | U+011C  | Ĝ     | G           | Latin capital letter G with circumflex            |
1314   * | U+011D  | ĝ     | g           | Latin small letter g with circumflex              |
1315   * | U+011E  | Ğ     | G           | Latin capital letter G with breve                 |
1316   * | U+011F  | ğ     | g           | Latin small letter g with breve                   |
1317   * | U+0120  | Ġ     | G           | Latin capital letter G with dot above             |
1318   * | U+0121  | ġ     | g           | Latin small letter g with dot above               |
1319   * | U+0122  | Ģ     | G           | Latin capital letter G with cedilla               |
1320   * | U+0123  | ģ     | g           | Latin small letter g with cedilla                 |
1321   * | U+0124  | Ĥ     | H           | Latin capital letter H with circumflex            |
1322   * | U+0125  | ĥ     | h           | Latin small letter h with circumflex              |
1323   * | U+0126  | Ħ     | H           | Latin capital letter H with stroke                |
1324   * | U+0127  | ħ     | h           | Latin small letter h with stroke                  |
1325   * | U+0128  | Ĩ     | I           | Latin capital letter I with tilde                 |
1326   * | U+0129  | ĩ     | i           | Latin small letter i with tilde                   |
1327   * | U+012A  | Ī     | I           | Latin capital letter I with macron                |
1328   * | U+012B  | ī     | i           | Latin small letter i with macron                  |
1329   * | U+012C  | Ĭ     | I           | Latin capital letter I with breve                 |
1330   * | U+012D  | ĭ     | i           | Latin small letter i with breve                   |
1331   * | U+012E  | Į     | I           | Latin capital letter I with ogonek                |
1332   * | U+012F  | į     | i           | Latin small letter i with ogonek                  |
1333   * | U+0130  | İ     | I           | Latin capital letter I with dot above             |
1334   * | U+0131  | ı     | i           | Latin small letter dotless i                      |
1335   * | U+0132  | IJ     | IJ          | Latin capital ligature IJ                         |
1336   * | U+0133  | ij     | ij          | Latin small ligature ij                           |
1337   * | U+0134  | Ĵ     | J           | Latin capital letter J with circumflex            |
1338   * | U+0135  | ĵ     | j           | Latin small letter j with circumflex              |
1339   * | U+0136  | Ķ     | K           | Latin capital letter K with cedilla               |
1340   * | U+0137  | ķ     | k           | Latin small letter k with cedilla                 |
1341   * | U+0138  | ĸ     | k           | Latin small letter Kra                            |
1342   * | U+0139  | Ĺ     | L           | Latin capital letter L with acute                 |
1343   * | U+013A  | ĺ     | l           | Latin small letter l with acute                   |
1344   * | U+013B  | Ļ     | L           | Latin capital letter L with cedilla               |
1345   * | U+013C  | ļ     | l           | Latin small letter l with cedilla                 |
1346   * | U+013D  | Ľ     | L           | Latin capital letter L with caron                 |
1347   * | U+013E  | ľ     | l           | Latin small letter l with caron                   |
1348   * | U+013F  | Ŀ     | L           | Latin capital letter L with middle dot            |
1349   * | U+0140  | ŀ     | l           | Latin small letter l with middle dot              |
1350   * | U+0141  | Ł     | L           | Latin capital letter L with stroke                |
1351   * | U+0142  | ł     | l           | Latin small letter l with stroke                  |
1352   * | U+0143  | Ń     | N           | Latin capital letter N with acute                 |
1353   * | U+0144  | ń     | n           | Latin small letter N with acute                   |
1354   * | U+0145  | Ņ     | N           | Latin capital letter N with cedilla               |
1355   * | U+0146  | ņ     | n           | Latin small letter n with cedilla                 |
1356   * | U+0147  | Ň     | N           | Latin capital letter N with caron                 |
1357   * | U+0148  | ň     | n           | Latin small letter n with caron                   |
1358   * | U+0149  | ʼn     | n           | Latin small letter n preceded by apostrophe       |
1359   * | U+014A  | Ŋ     | N           | Latin capital letter Eng                          |
1360   * | U+014B  | ŋ     | n           | Latin small letter Eng                            |
1361   * | U+014C  | Ō     | O           | Latin capital letter O with macron                |
1362   * | U+014D  | ō     | o           | Latin small letter o with macron                  |
1363   * | U+014E  | Ŏ     | O           | Latin capital letter O with breve                 |
1364   * | U+014F  | ŏ     | o           | Latin small letter o with breve                   |
1365   * | U+0150  | Ő     | O           | Latin capital letter O with double acute          |
1366   * | U+0151  | ő     | o           | Latin small letter o with double acute            |
1367   * | U+0152  | Π    | OE          | Latin capital ligature OE                         |
1368   * | U+0153  | œ     | oe          | Latin small ligature oe                           |
1369   * | U+0154  | Ŕ     | R           | Latin capital letter R with acute                 |
1370   * | U+0155  | ŕ     | r           | Latin small letter r with acute                   |
1371   * | U+0156  | Ŗ     | R           | Latin capital letter R with cedilla               |
1372   * | U+0157  | ŗ     | r           | Latin small letter r with cedilla                 |
1373   * | U+0158  | Ř     | R           | Latin capital letter R with caron                 |
1374   * | U+0159  | ř     | r           | Latin small letter r with caron                   |
1375   * | U+015A  | Ś     | S           | Latin capital letter S with acute                 |
1376   * | U+015B  | ś     | s           | Latin small letter s with acute                   |
1377   * | U+015C  | Ŝ     | S           | Latin capital letter S with circumflex            |
1378   * | U+015D  | ŝ     | s           | Latin small letter s with circumflex              |
1379   * | U+015E  | Ş     | S           | Latin capital letter S with cedilla               |
1380   * | U+015F  | ş     | s           | Latin small letter s with cedilla                 |
1381   * | U+0160  | Š     | S           | Latin capital letter S with caron                 |
1382   * | U+0161  | š     | s           | Latin small letter s with caron                   |
1383   * | U+0162  | Ţ     | T           | Latin capital letter T with cedilla               |
1384   * | U+0163  | ţ     | t           | Latin small letter t with cedilla                 |
1385   * | U+0164  | Ť     | T           | Latin capital letter T with caron                 |
1386   * | U+0165  | ť     | t           | Latin small letter t with caron                   |
1387   * | U+0166  | Ŧ     | T           | Latin capital letter T with stroke                |
1388   * | U+0167  | ŧ     | t           | Latin small letter t with stroke                  |
1389   * | U+0168  | Ũ     | U           | Latin capital letter U with tilde                 |
1390   * | U+0169  | ũ     | u           | Latin small letter u with tilde                   |
1391   * | U+016A  | Ū     | U           | Latin capital letter U with macron                |
1392   * | U+016B  | ū     | u           | Latin small letter u with macron                  |
1393   * | U+016C  | Ŭ     | U           | Latin capital letter U with breve                 |
1394   * | U+016D  | ŭ     | u           | Latin small letter u with breve                   |
1395   * | U+016E  | Ů     | U           | Latin capital letter U with ring above            |
1396   * | U+016F  | ů     | u           | Latin small letter u with ring above              |
1397   * | U+0170  | Ű     | U           | Latin capital letter U with double acute          |
1398   * | U+0171  | ű     | u           | Latin small letter u with double acute            |
1399   * | U+0172  | Ų     | U           | Latin capital letter U with ogonek                |
1400   * | U+0173  | ų     | u           | Latin small letter u with ogonek                  |
1401   * | U+0174  | Ŵ     | W           | Latin capital letter W with circumflex            |
1402   * | U+0175  | ŵ     | w           | Latin small letter w with circumflex              |
1403   * | U+0176  | Ŷ     | Y           | Latin capital letter Y with circumflex            |
1404   * | U+0177  | ŷ     | y           | Latin small letter y with circumflex              |
1405   * | U+0178  | Ÿ     | Y           | Latin capital letter Y with diaeresis             |
1406   * | U+0179  | Ź     | Z           | Latin capital letter Z with acute                 |
1407   * | U+017A  | ź     | z           | Latin small letter z with acute                   |
1408   * | U+017B  | Ż     | Z           | Latin capital letter Z with dot above             |
1409   * | U+017C  | ż     | z           | Latin small letter z with dot above               |
1410   * | U+017D  | Ž     | Z           | Latin capital letter Z with caron                 |
1411   * | U+017E  | ž     | z           | Latin small letter z with caron                   |
1412   * | U+017F  | ſ     | s           | Latin small letter long s                         |
1413   * | U+01A0  | Ơ     | O           | Latin capital letter O with horn                  |
1414   * | U+01A1  | ơ     | o           | Latin small letter o with horn                    |
1415   * | U+01AF  | Ư     | U           | Latin capital letter U with horn                  |
1416   * | U+01B0  | ư     | u           | Latin small letter u with horn                    |
1417   * | U+01CD  | Ǎ     | A           | Latin capital letter A with caron                 |
1418   * | U+01CE  | ǎ     | a           | Latin small letter a with caron                   |
1419   * | U+01CF  | Ǐ     | I           | Latin capital letter I with caron                 |
1420   * | U+01D0  | ǐ     | i           | Latin small letter i with caron                   |
1421   * | U+01D1  | Ǒ     | O           | Latin capital letter O with caron                 |
1422   * | U+01D2  | ǒ     | o           | Latin small letter o with caron                   |
1423   * | U+01D3  | Ǔ     | U           | Latin capital letter U with caron                 |
1424   * | U+01D4  | ǔ     | u           | Latin small letter u with caron                   |
1425   * | U+01D5  | Ǖ     | U           | Latin capital letter U with diaeresis and macron  |
1426   * | U+01D6  | ǖ     | u           | Latin small letter u with diaeresis and macron    |
1427   * | U+01D7  | Ǘ     | U           | Latin capital letter U with diaeresis and acute   |
1428   * | U+01D8  | ǘ     | u           | Latin small letter u with diaeresis and acute     |
1429   * | U+01D9  | Ǚ     | U           | Latin capital letter U with diaeresis and caron   |
1430   * | U+01DA  | ǚ     | u           | Latin small letter u with diaeresis and caron     |
1431   * | U+01DB  | Ǜ     | U           | Latin capital letter U with diaeresis and grave   |
1432   * | U+01DC  | ǜ     | u           | Latin small letter u with diaeresis and grave     |
1433   *
1434   * Decompositions for Latin Extended-B:
1435   *
1436   * |   Code   | Glyph | Replacement |                Description                |
1437   * | -------- | ----- | ----------- | ----------------------------------------- |
1438   * | U+0218   | Ș     | S           | Latin capital letter S with comma below   |
1439   * | U+0219   | ș     | s           | Latin small letter s with comma below     |
1440   * | U+021A   | Ț     | T           | Latin capital letter T with comma below   |
1441   * | U+021B   | ț     | t           | Latin small letter t with comma below     |
1442   *
1443   * Vowels with diacritic (Chinese, Hanyu Pinyin):
1444   *
1445   * |   Code   | Glyph | Replacement |                      Description                      |
1446   * | -------- | ----- | ----------- | ----------------------------------------------------- |
1447   * | U+0251   | ɑ     | a           | Latin small letter alpha                              |
1448   * | U+1EA0   | Ạ     | A           | Latin capital letter A with dot below                 |
1449   * | U+1EA1   | ạ     | a           | Latin small letter a with dot below                   |
1450   * | U+1EA2   | Ả     | A           | Latin capital letter A with hook above                |
1451   * | U+1EA3   | ả     | a           | Latin small letter a with hook above                  |
1452   * | U+1EA4   | Ấ     | A           | Latin capital letter A with circumflex and acute      |
1453   * | U+1EA5   | ấ     | a           | Latin small letter a with circumflex and acute        |
1454   * | U+1EA6   | Ầ     | A           | Latin capital letter A with circumflex and grave      |
1455   * | U+1EA7   | ầ     | a           | Latin small letter a with circumflex and grave        |
1456   * | U+1EA8   | Ẩ     | A           | Latin capital letter A with circumflex and hook above |
1457   * | U+1EA9   | ẩ     | a           | Latin small letter a with circumflex and hook above   |
1458   * | U+1EAA   | Ẫ     | A           | Latin capital letter A with circumflex and tilde      |
1459   * | U+1EAB   | ẫ     | a           | Latin small letter a with circumflex and tilde        |
1460   * | U+1EA6   | Ậ     | A           | Latin capital letter A with circumflex and dot below  |
1461   * | U+1EAD   | ậ     | a           | Latin small letter a with circumflex and dot below    |
1462   * | U+1EAE   | Ắ     | A           | Latin capital letter A with breve and acute           |
1463   * | U+1EAF   | ắ     | a           | Latin small letter a with breve and acute             |
1464   * | U+1EB0   | Ằ     | A           | Latin capital letter A with breve and grave           |
1465   * | U+1EB1   | ằ     | a           | Latin small letter a with breve and grave             |
1466   * | U+1EB2   | Ẳ     | A           | Latin capital letter A with breve and hook above      |
1467   * | U+1EB3   | ẳ     | a           | Latin small letter a with breve and hook above        |
1468   * | U+1EB4   | Ẵ     | A           | Latin capital letter A with breve and tilde           |
1469   * | U+1EB5   | ẵ     | a           | Latin small letter a with breve and tilde             |
1470   * | U+1EB6   | Ặ     | A           | Latin capital letter A with breve and dot below       |
1471   * | U+1EB7   | ặ     | a           | Latin small letter a with breve and dot below         |
1472   * | U+1EB8   | Ẹ     | E           | Latin capital letter E with dot below                 |
1473   * | U+1EB9   | ẹ     | e           | Latin small letter e with dot below                   |
1474   * | U+1EBA   | Ẻ     | E           | Latin capital letter E with hook above                |
1475   * | U+1EBB   | ẻ     | e           | Latin small letter e with hook above                  |
1476   * | U+1EBC   | Ẽ     | E           | Latin capital letter E with tilde                     |
1477   * | U+1EBD   | ẽ     | e           | Latin small letter e with tilde                       |
1478   * | U+1EBE   | Ế     | E           | Latin capital letter E with circumflex and acute      |
1479   * | U+1EBF   | ế     | e           | Latin small letter e with circumflex and acute        |
1480   * | U+1EC0   | Ề     | E           | Latin capital letter E with circumflex and grave      |
1481   * | U+1EC1   | ề     | e           | Latin small letter e with circumflex and grave        |
1482   * | U+1EC2   | Ể     | E           | Latin capital letter E with circumflex and hook above |
1483   * | U+1EC3   | ể     | e           | Latin small letter e with circumflex and hook above   |
1484   * | U+1EC4   | Ễ     | E           | Latin capital letter E with circumflex and tilde      |
1485   * | U+1EC5   | ễ     | e           | Latin small letter e with circumflex and tilde        |
1486   * | U+1EC6   | Ệ     | E           | Latin capital letter E with circumflex and dot below  |
1487   * | U+1EC7   | ệ     | e           | Latin small letter e with circumflex and dot below    |
1488   * | U+1EC8   | Ỉ     | I           | Latin capital letter I with hook above                |
1489   * | U+1EC9   | ỉ     | i           | Latin small letter i with hook above                  |
1490   * | U+1ECA   | Ị     | I           | Latin capital letter I with dot below                 |
1491   * | U+1ECB   | ị     | i           | Latin small letter i with dot below                   |
1492   * | U+1ECC   | Ọ     | O           | Latin capital letter O with dot below                 |
1493   * | U+1ECD   | ọ     | o           | Latin small letter o with dot below                   |
1494   * | U+1ECE   | Ỏ     | O           | Latin capital letter O with hook above                |
1495   * | U+1ECF   | ỏ     | o           | Latin small letter o with hook above                  |
1496   * | U+1ED0   | Ố     | O           | Latin capital letter O with circumflex and acute      |
1497   * | U+1ED1   | ố     | o           | Latin small letter o with circumflex and acute        |
1498   * | U+1ED2   | Ồ     | O           | Latin capital letter O with circumflex and grave      |
1499   * | U+1ED3   | ồ     | o           | Latin small letter o with circumflex and grave        |
1500   * | U+1ED4   | Ổ     | O           | Latin capital letter O with circumflex and hook above |
1501   * | U+1ED5   | ổ     | o           | Latin small letter o with circumflex and hook above   |
1502   * | U+1ED6   | Ỗ     | O           | Latin capital letter O with circumflex and tilde      |
1503   * | U+1ED7   | ỗ     | o           | Latin small letter o with circumflex and tilde        |
1504   * | U+1ED8   | Ộ     | O           | Latin capital letter O with circumflex and dot below  |
1505   * | U+1ED9   | ộ     | o           | Latin small letter o with circumflex and dot below    |
1506   * | U+1EDA   | Ớ     | O           | Latin capital letter O with horn and acute            |
1507   * | U+1EDB   | ớ     | o           | Latin small letter o with horn and acute              |
1508   * | U+1EDC   | Ờ     | O           | Latin capital letter O with horn and grave            |
1509   * | U+1EDD   | ờ     | o           | Latin small letter o with horn and grave              |
1510   * | U+1EDE   | Ở     | O           | Latin capital letter O with horn and hook above       |
1511   * | U+1EDF   | ở     | o           | Latin small letter o with horn and hook above         |
1512   * | U+1EE0   | Ỡ     | O           | Latin capital letter O with horn and tilde            |
1513   * | U+1EE1   | ỡ     | o           | Latin small letter o with horn and tilde              |
1514   * | U+1EE2   | Ợ     | O           | Latin capital letter O with horn and dot below        |
1515   * | U+1EE3   | ợ     | o           | Latin small letter o with horn and dot below          |
1516   * | U+1EE4   | Ụ     | U           | Latin capital letter U with dot below                 |
1517   * | U+1EE5   | ụ     | u           | Latin small letter u with dot below                   |
1518   * | U+1EE6   | Ủ     | U           | Latin capital letter U with hook above                |
1519   * | U+1EE7   | ủ     | u           | Latin small letter u with hook above                  |
1520   * | U+1EE8   | Ứ     | U           | Latin capital letter U with horn and acute            |
1521   * | U+1EE9   | ứ     | u           | Latin small letter u with horn and acute              |
1522   * | U+1EEA   | Ừ     | U           | Latin capital letter U with horn and grave            |
1523   * | U+1EEB   | ừ     | u           | Latin small letter u with horn and grave              |
1524   * | U+1EEC   | Ử     | U           | Latin capital letter U with horn and hook above       |
1525   * | U+1EED   | ử     | u           | Latin small letter u with horn and hook above         |
1526   * | U+1EEE   | Ữ     | U           | Latin capital letter U with horn and tilde            |
1527   * | U+1EEF   | ữ     | u           | Latin small letter u with horn and tilde              |
1528   * | U+1EF0   | Ự     | U           | Latin capital letter U with horn and dot below        |
1529   * | U+1EF1   | ự     | u           | Latin small letter u with horn and dot below          |
1530   * | U+1EF2   | Ỳ     | Y           | Latin capital letter Y with grave                     |
1531   * | U+1EF3   | ỳ     | y           | Latin small letter y with grave                       |
1532   * | U+1EF4   | Ỵ     | Y           | Latin capital letter Y with dot below                 |
1533   * | U+1EF5   | ỵ     | y           | Latin small letter y with dot below                   |
1534   * | U+1EF6   | Ỷ     | Y           | Latin capital letter Y with hook above                |
1535   * | U+1EF7   | ỷ     | y           | Latin small letter y with hook above                  |
1536   * | U+1EF8   | Ỹ     | Y           | Latin capital letter Y with tilde                     |
1537   * | U+1EF9   | ỹ     | y           | Latin small letter y with tilde                       |
1538   *
1539   * German (`de_DE`), German formal (`de_DE_formal`), German (Switzerland) formal (`de_CH`),
1540   * and German (Switzerland) informal (`de_CH_informal`) locales:
1541   *
1542   * |   Code   | Glyph | Replacement |               Description               |
1543   * | -------- | ----- | ----------- | --------------------------------------- |
1544   * | U+00C4   | Ä     | Ae          | Latin capital letter A with diaeresis   |
1545   * | U+00E4   | ä     | ae          | Latin small letter a with diaeresis     |
1546   * | U+00D6   | Ö     | Oe          | Latin capital letter O with diaeresis   |
1547   * | U+00F6   | ö     | oe          | Latin small letter o with diaeresis     |
1548   * | U+00DC   | Ü     | Ue          | Latin capital letter U with diaeresis   |
1549   * | U+00FC   | ü     | ue          | Latin small letter u with diaeresis     |
1550   * | U+00DF   | ß     | ss          | Latin small letter sharp s              |
1551   *
1552   * Danish (`da_DK`) locale:
1553   *
1554   * |   Code   | Glyph | Replacement |               Description               |
1555   * | -------- | ----- | ----------- | --------------------------------------- |
1556   * | U+00C6   | Æ     | Ae          | Latin capital letter AE                 |
1557   * | U+00E6   | æ     | ae          | Latin small letter ae                   |
1558   * | U+00D8   | Ø     | Oe          | Latin capital letter O with stroke      |
1559   * | U+00F8   | ø     | oe          | Latin small letter o with stroke        |
1560   * | U+00C5   | Å     | Aa          | Latin capital letter A with ring above  |
1561   * | U+00E5   | å     | aa          | Latin small letter a with ring above    |
1562   *
1563   * Catalan (`ca`) locale:
1564   *
1565   * |   Code   | Glyph | Replacement |               Description               |
1566   * | -------- | ----- | ----------- | --------------------------------------- |
1567   * | U+00B7   | l·l   | ll          | Flown dot (between two Ls)              |
1568   *
1569   * Serbian (`sr_RS`) and Bosnian (`bs_BA`) locales:
1570   *
1571   * |   Code   | Glyph | Replacement |               Description               |
1572   * | -------- | ----- | ----------- | --------------------------------------- |
1573   * | U+0110   | Đ     | DJ          | Latin capital letter D with stroke      |
1574   * | U+0111   | đ     | dj          | Latin small letter d with stroke        |
1575   *
1576   * @since 1.2.1
1577   * @since 4.6.0 Added locale support for `de_CH`, `de_CH_informal`, and `ca`.
1578   * @since 4.7.0 Added locale support for `sr_RS`.
1579   * @since 4.8.0 Added locale support for `bs_BA`.
1580   *
1581   * @param string $string Text that might have accent characters
1582   * @return string Filtered string with replaced "nice" characters.
1583   */
1584  function remove_accents( $string ) {
1585      if ( ! preg_match( '/[\x80-\xff]/', $string ) ) {
1586          return $string;
1587      }
1588  
1589      if ( seems_utf8( $string ) ) {
1590          $chars = array(
1591              // Decompositions for Latin-1 Supplement.
1592              'ª' => 'a',
1593              'º' => 'o',
1594              'À' => 'A',
1595              'Á' => 'A',
1596              'Â' => 'A',
1597              'Ã' => 'A',
1598              'Ä' => 'A',
1599              'Å' => 'A',
1600              'Æ' => 'AE',
1601              'Ç' => 'C',
1602              'È' => 'E',
1603              'É' => 'E',
1604              'Ê' => 'E',
1605              'Ë' => 'E',
1606              'Ì' => 'I',
1607              'Í' => 'I',
1608              'Î' => 'I',
1609              'Ï' => 'I',
1610              'Ð' => 'D',
1611              'Ñ' => 'N',
1612              'Ò' => 'O',
1613              'Ó' => 'O',
1614              'Ô' => 'O',
1615              'Õ' => 'O',
1616              'Ö' => 'O',
1617              'Ù' => 'U',
1618              'Ú' => 'U',
1619              'Û' => 'U',
1620              'Ü' => 'U',
1621              'Ý' => 'Y',
1622              'Þ' => 'TH',
1623              'ß' => 's',
1624              'à' => 'a',
1625              'á' => 'a',
1626              'â' => 'a',
1627              'ã' => 'a',
1628              'ä' => 'a',
1629              'å' => 'a',
1630              'æ' => 'ae',
1631              'ç' => 'c',
1632              'è' => 'e',
1633              'é' => 'e',
1634              'ê' => 'e',
1635              'ë' => 'e',
1636              'ì' => 'i',
1637              'í' => 'i',
1638              'î' => 'i',
1639              'ï' => 'i',
1640              'ð' => 'd',
1641              'ñ' => 'n',
1642              'ò' => 'o',
1643              'ó' => 'o',
1644              'ô' => 'o',
1645              'õ' => 'o',
1646              'ö' => 'o',
1647              'ø' => 'o',
1648              'ù' => 'u',
1649              'ú' => 'u',
1650              'û' => 'u',
1651              'ü' => 'u',
1652              'ý' => 'y',
1653              'þ' => 'th',
1654              'ÿ' => 'y',
1655              'Ø' => 'O',
1656              // Decompositions for Latin Extended-A.
1657              'Ā' => 'A',
1658              'ā' => 'a',
1659              'Ă' => 'A',
1660              'ă' => 'a',
1661              'Ą' => 'A',
1662              'ą' => 'a',
1663              'Ć' => 'C',
1664              'ć' => 'c',
1665              'Ĉ' => 'C',
1666              'ĉ' => 'c',
1667              'Ċ' => 'C',
1668              'ċ' => 'c',
1669              'Č' => 'C',
1670              'č' => 'c',
1671              'Ď' => 'D',
1672              'ď' => 'd',
1673              'Đ' => 'D',
1674              'đ' => 'd',
1675              'Ē' => 'E',
1676              'ē' => 'e',
1677              'Ĕ' => 'E',
1678              'ĕ' => 'e',
1679              'Ė' => 'E',
1680              'ė' => 'e',
1681              'Ę' => 'E',
1682              'ę' => 'e',
1683              'Ě' => 'E',
1684              'ě' => 'e',
1685              'Ĝ' => 'G',
1686              'ĝ' => 'g',
1687              'Ğ' => 'G',
1688              'ğ' => 'g',
1689              'Ġ' => 'G',
1690              'ġ' => 'g',
1691              'Ģ' => 'G',
1692              'ģ' => 'g',
1693              'Ĥ' => 'H',
1694              'ĥ' => 'h',
1695              'Ħ' => 'H',
1696              'ħ' => 'h',
1697              'Ĩ' => 'I',
1698              'ĩ' => 'i',
1699              'Ī' => 'I',
1700              'ī' => 'i',
1701              'Ĭ' => 'I',
1702              'ĭ' => 'i',
1703              'Į' => 'I',
1704              'į' => 'i',
1705              'İ' => 'I',
1706              'ı' => 'i',
1707              'IJ' => 'IJ',
1708              'ij' => 'ij',
1709              'Ĵ' => 'J',
1710              'ĵ' => 'j',
1711              'Ķ' => 'K',
1712              'ķ' => 'k',
1713              'ĸ' => 'k',
1714              'Ĺ' => 'L',
1715              'ĺ' => 'l',
1716              'Ļ' => 'L',
1717              'ļ' => 'l',
1718              'Ľ' => 'L',
1719              'ľ' => 'l',
1720              'Ŀ' => 'L',
1721              'ŀ' => 'l',
1722              'Ł' => 'L',
1723              'ł' => 'l',
1724              'Ń' => 'N',
1725              'ń' => 'n',
1726              'Ņ' => 'N',
1727              'ņ' => 'n',
1728              'Ň' => 'N',
1729              'ň' => 'n',
1730              'ʼn' => 'n',
1731              'Ŋ' => 'N',
1732              'ŋ' => 'n',
1733              'Ō' => 'O',
1734              'ō' => 'o',
1735              'Ŏ' => 'O',
1736              'ŏ' => 'o',
1737              'Ő' => 'O',
1738              'ő' => 'o',
1739              'Œ' => 'OE',
1740              'œ' => 'oe',
1741              'Ŕ' => 'R',
1742              'ŕ' => 'r',
1743              'Ŗ' => 'R',
1744              'ŗ' => 'r',
1745              'Ř' => 'R',
1746              'ř' => 'r',
1747              'Ś' => 'S',
1748              'ś' => 's',
1749              'Ŝ' => 'S',
1750              'ŝ' => 's',
1751              'Ş' => 'S',
1752              'ş' => 's',
1753              'Š' => 'S',
1754              'š' => 's',
1755              'Ţ' => 'T',
1756              'ţ' => 't',
1757              'Ť' => 'T',
1758              'ť' => 't',
1759              'Ŧ' => 'T',
1760              'ŧ' => 't',
1761              'Ũ' => 'U',
1762              'ũ' => 'u',
1763              'Ū' => 'U',
1764              'ū' => 'u',
1765              'Ŭ' => 'U',
1766              'ŭ' => 'u',
1767              'Ů' => 'U',
1768              'ů' => 'u',
1769              'Ű' => 'U',
1770              'ű' => 'u',
1771              'Ų' => 'U',
1772              'ų' => 'u',
1773              'Ŵ' => 'W',
1774              'ŵ' => 'w',
1775              'Ŷ' => 'Y',
1776              'ŷ' => 'y',
1777              'Ÿ' => 'Y',
1778              'Ź' => 'Z',
1779              'ź' => 'z',
1780              'Ż' => 'Z',
1781              'ż' => 'z',
1782              'Ž' => 'Z',
1783              'ž' => 'z',
1784              'ſ' => 's',
1785              // Decompositions for Latin Extended-B.
1786              'Ș' => 'S',
1787              'ș' => 's',
1788              'Ț' => 'T',
1789              'ț' => 't',
1790              // Euro sign.
1791              '€' => 'E',
1792              // GBP (Pound) sign.
1793              '£' => '',
1794              // Vowels with diacritic (Vietnamese).
1795              // Unmarked.
1796              'Ơ' => 'O',
1797              'ơ' => 'o',
1798              'Ư' => 'U',
1799              'ư' => 'u',
1800              // Grave accent.
1801              'Ầ' => 'A',
1802              'ầ' => 'a',
1803              'Ằ' => 'A',
1804              'ằ' => 'a',
1805              'Ề' => 'E',
1806              'ề' => 'e',
1807              'Ồ' => 'O',
1808              'ồ' => 'o',
1809              'Ờ' => 'O',
1810              'ờ' => 'o',
1811              'Ừ' => 'U',
1812              'ừ' => 'u',
1813              'Ỳ' => 'Y',
1814              'ỳ' => 'y',
1815              // Hook.
1816              'Ả' => 'A',
1817              'ả' => 'a',
1818              'Ẩ' => 'A',
1819              'ẩ' => 'a',
1820              'Ẳ' => 'A',
1821              'ẳ' => 'a',
1822              'Ẻ' => 'E',
1823              'ẻ' => 'e',
1824              'Ể' => 'E',
1825              'ể' => 'e',
1826              'Ỉ' => 'I',
1827              'ỉ' => 'i',
1828              'Ỏ' => 'O',
1829              'ỏ' => 'o',
1830              'Ổ' => 'O',
1831              'ổ' => 'o',
1832              'Ở' => 'O',
1833              'ở' => 'o',
1834              'Ủ' => 'U',
1835              'ủ' => 'u',
1836              'Ử' => 'U',
1837              'ử' => 'u',
1838              'Ỷ' => 'Y',
1839              'ỷ' => 'y',
1840              // Tilde.
1841              'Ẫ' => 'A',
1842              'ẫ' => 'a',
1843              'Ẵ' => 'A',
1844              'ẵ' => 'a',
1845              'Ẽ' => 'E',
1846              'ẽ' => 'e',
1847              'Ễ' => 'E',
1848              'ễ' => 'e',
1849              'Ỗ' => 'O',
1850              'ỗ' => 'o',
1851              'Ỡ' => 'O',
1852              'ỡ' => 'o',
1853              'Ữ' => 'U',
1854              'ữ' => 'u',
1855              'Ỹ' => 'Y',
1856              'ỹ' => 'y',
1857              // Acute accent.
1858              'Ấ' => 'A',
1859              'ấ' => 'a',
1860              'Ắ' => 'A',
1861              'ắ' => 'a',
1862              'Ế' => 'E',
1863              'ế' => 'e',
1864              'Ố' => 'O',
1865              'ố' => 'o',
1866              'Ớ' => 'O',
1867              'ớ' => 'o',
1868              'Ứ' => 'U',
1869              'ứ' => 'u',
1870              // Dot below.
1871              'Ạ' => 'A',
1872              'ạ' => 'a',
1873              'Ậ' => 'A',
1874              'ậ' => 'a',
1875              'Ặ' => 'A',
1876              'ặ' => 'a',
1877              'Ẹ' => 'E',
1878              'ẹ' => 'e',
1879              'Ệ' => 'E',
1880              'ệ' => 'e',
1881              'Ị' => 'I',
1882              'ị' => 'i',
1883              'Ọ' => 'O',
1884              'ọ' => 'o',
1885              'Ộ' => 'O',
1886              'ộ' => 'o',
1887              'Ợ' => 'O',
1888              'ợ' => 'o',
1889              'Ụ' => 'U',
1890              'ụ' => 'u',
1891              'Ự' => 'U',
1892              'ự' => 'u',
1893              'Ỵ' => 'Y',
1894              'ỵ' => 'y',
1895              // Vowels with diacritic (Chinese, Hanyu Pinyin).
1896              'ɑ' => 'a',
1897              // Macron.
1898              'Ǖ' => 'U',
1899              'ǖ' => 'u',
1900              // Acute accent.
1901              'Ǘ' => 'U',
1902              'ǘ' => 'u',
1903              // Caron.
1904              'Ǎ' => 'A',
1905              'ǎ' => 'a',
1906              'Ǐ' => 'I',
1907              'ǐ' => 'i',
1908              'Ǒ' => 'O',
1909              'ǒ' => 'o',
1910              'Ǔ' => 'U',
1911              'ǔ' => 'u',
1912              'Ǚ' => 'U',
1913              'ǚ' => 'u',
1914              // Grave accent.
1915              'Ǜ' => 'U',
1916              'ǜ' => 'u',
1917          );
1918  
1919          // Used for locale-specific rules.
1920          $locale = get_locale();
1921  
1922          if ( in_array( $locale, array( 'de_DE', 'de_DE_formal', 'de_CH', 'de_CH_informal' ), true ) ) {
1923              $chars['Ä'] = 'Ae';
1924              $chars['ä'] = 'ae';
1925              $chars['Ö'] = 'Oe';
1926              $chars['ö'] = 'oe';
1927              $chars['Ü'] = 'Ue';
1928              $chars['ü'] = 'ue';
1929              $chars['ß'] = 'ss';
1930          } elseif ( 'da_DK' === $locale ) {
1931              $chars['Æ'] = 'Ae';
1932              $chars['æ'] = 'ae';
1933              $chars['Ø'] = 'Oe';
1934              $chars['ø'] = 'oe';
1935              $chars['Å'] = 'Aa';
1936              $chars['å'] = 'aa';
1937          } elseif ( 'ca' === $locale ) {
1938              $chars['l·l'] = 'll';
1939          } elseif ( 'sr_RS' === $locale || 'bs_BA' === $locale ) {
1940              $chars['Đ'] = 'DJ';
1941              $chars['đ'] = 'dj';
1942          }
1943  
1944          $string = strtr( $string, $chars );
1945      } else {
1946          $chars = array();
1947          // Assume ISO-8859-1 if not UTF-8.
1948          $chars['in'] = "\x80\x83\x8a\x8e\x9a\x9e"
1949              . "\x9f\xa2\xa5\xb5\xc0\xc1\xc2"
1950              . "\xc3\xc4\xc5\xc7\xc8\xc9\xca"
1951              . "\xcb\xcc\xcd\xce\xcf\xd1\xd2"
1952              . "\xd3\xd4\xd5\xd6\xd8\xd9\xda"
1953              . "\xdb\xdc\xdd\xe0\xe1\xe2\xe3"
1954              . "\xe4\xe5\xe7\xe8\xe9\xea\xeb"
1955              . "\xec\xed\xee\xef\xf1\xf2\xf3"
1956              . "\xf4\xf5\xf6\xf8\xf9\xfa\xfb"
1957              . "\xfc\xfd\xff";
1958  
1959          $chars['out'] = 'EfSZszYcYuAAAAAACEEEEIIIINOOOOOOUUUUYaaaaaaceeeeiiiinoooooouuuuyy';
1960  
1961          $string              = strtr( $string, $chars['in'], $chars['out'] );
1962          $double_chars        = array();
1963          $double_chars['in']  = array( "\x8c", "\x9c", "\xc6", "\xd0", "\xde", "\xdf", "\xe6", "\xf0", "\xfe" );
1964          $double_chars['out'] = array( 'OE', 'oe', 'AE', 'DH', 'TH', 'ss', 'ae', 'dh', 'th' );
1965          $string              = str_replace( $double_chars['in'], $double_chars['out'], $string );
1966      }
1967  
1968      return $string;
1969  }
1970  
1971  /**
1972   * Sanitizes a filename, replacing whitespace with dashes.
1973   *
1974   * Removes special characters that are illegal in filenames on certain
1975   * operating systems and special characters requiring special escaping
1976   * to manipulate at the command line. Replaces spaces and consecutive
1977   * dashes with a single dash. Trims period, dash and underscore from beginning
1978   * and end of filename. It is not guaranteed that this function will return a
1979   * filename that is allowed to be uploaded.
1980   *
1981   * @since 2.1.0
1982   *
1983   * @param string $filename The filename to be sanitized.
1984   * @return string The sanitized filename.
1985   */
1986  function sanitize_file_name( $filename ) {
1987      $filename_raw  = $filename;
1988      $special_chars = array( '?', '[', ']', '/', '\\', '=', '<', '>', ':', ';', ',', "'", '"', '&', '$', '#', '*', '(', ')', '|', '~', '`', '!', '{', '}', '%', '+', chr( 0 ) );
1989  
1990      // Check for support for utf8 in the installed PCRE library once and store the result in a static.
1991      static $utf8_pcre = null;
1992      if ( ! isset( $utf8_pcre ) ) {
1993          // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
1994          $utf8_pcre = @preg_match( '/^./u', 'a' );
1995      }
1996  
1997      if ( ! seems_utf8( $filename ) ) {
1998          $_ext     = pathinfo( $filename, PATHINFO_EXTENSION );
1999          $_name    = pathinfo( $filename, PATHINFO_FILENAME );
2000          $filename = sanitize_title_with_dashes( $_name ) . '.' . $_ext;
2001      }
2002  
2003      if ( $utf8_pcre ) {
2004          $filename = preg_replace( "#\x{00a0}#siu", ' ', $filename );
2005      }
2006  
2007      /**
2008       * Filters the list of characters to remove from a filename.
2009       *
2010       * @since 2.8.0
2011       *
2012       * @param string[] $special_chars Array of characters to remove.
2013       * @param string   $filename_raw  The original filename to be sanitized.
2014       */
2015      $special_chars = apply_filters( 'sanitize_file_name_chars', $special_chars, $filename_raw );
2016      $filename      = str_replace( $special_chars, '', $filename );
2017      $filename      = str_replace( array( '%20', '+' ), '-', $filename );
2018      $filename      = preg_replace( '/[\r\n\t -]+/', '-', $filename );
2019      $filename      = trim( $filename, '.-_' );
2020  
2021      if ( false === strpos( $filename, '.' ) ) {
2022          $mime_types = wp_get_mime_types();
2023          $filetype   = wp_check_filetype( 'test.' . $filename, $mime_types );
2024          if ( $filetype['ext'] === $filename ) {
2025              $filename = 'unnamed-file.' . $filetype['ext'];
2026          }
2027      }
2028  
2029      // Split the filename into a base and extension[s].
2030      $parts = explode( '.', $filename );
2031  
2032      // Return if only one extension.
2033      if ( count( $parts ) <= 2 ) {
2034          /**
2035           * Filters a sanitized filename string.
2036           *
2037           * @since 2.8.0
2038           *
2039           * @param string $filename     Sanitized filename.
2040           * @param string $filename_raw The filename prior to sanitization.
2041           */
2042          return apply_filters( 'sanitize_file_name', $filename, $filename_raw );
2043      }
2044  
2045      // Process multiple extensions.
2046      $filename  = array_shift( $parts );
2047      $extension = array_pop( $parts );
2048      $mimes     = get_allowed_mime_types();
2049  
2050      /*
2051       * Loop over any intermediate extensions. Postfix them with a trailing underscore
2052       * if they are a 2 - 5 character long alpha string not in the allowed extension list.
2053       */
2054      foreach ( (array) $parts as $part ) {
2055          $filename .= '.' . $part;
2056  
2057          if ( preg_match( '/^[a-zA-Z]{2,5}\d?$/', $part ) ) {
2058              $allowed = false;
2059              foreach ( $mimes as $ext_preg => $mime_match ) {
2060                  $ext_preg = '!^(' . $ext_preg . ')$!i';
2061                  if ( preg_match( $ext_preg, $part ) ) {
2062                      $allowed = true;
2063                      break;
2064                  }
2065              }
2066              if ( ! $allowed ) {
2067                  $filename .= '_';
2068              }
2069          }
2070      }
2071      $filename .= '.' . $extension;
2072      /** This filter is documented in wp-includes/formatting.php */
2073      return apply_filters( 'sanitize_file_name', $filename, $filename_raw );
2074  }
2075  
2076  /**
2077   * Sanitizes a username, stripping out unsafe characters.
2078   *
2079   * Removes tags, octets, entities, and if strict is enabled, will only keep
2080   * alphanumeric, _, space, ., -, @. After sanitizing, it passes the username,
2081   * raw username (the username in the parameter), and the value of $strict as
2082   * parameters for the {@see 'sanitize_user'} filter.
2083   *
2084   * @since 2.0.0
2085   *
2086   * @param string $username The username to be sanitized.
2087   * @param bool   $strict   Optional. If set limits $username to specific characters.
2088   *                         Default false.
2089   * @return string The sanitized username, after passing through filters.
2090   */
2091  function sanitize_user( $username, $strict = false ) {
2092      $raw_username = $username;
2093      $username     = wp_strip_all_tags( $username );
2094      $username     = remove_accents( $username );
2095      // Kill octets.
2096      $username = preg_replace( '|%([a-fA-F0-9][a-fA-F0-9])|', '', $username );
2097      // Kill entities.
2098      $username = preg_replace( '/&.+?;/', '', $username );
2099  
2100      // If strict, reduce to ASCII for max portability.
2101      if ( $strict ) {
2102          $username = preg_replace( '|[^a-z0-9 _.\-@]|i', '', $username );
2103      }
2104  
2105      $username = trim( $username );
2106      // Consolidate contiguous whitespace.
2107      $username = preg_replace( '|\s+|', ' ', $username );
2108  
2109      /**
2110       * Filters a sanitized username string.
2111       *
2112       * @since 2.0.1
2113       *
2114       * @param string $username     Sanitized username.
2115       * @param string $raw_username The username prior to sanitization.
2116       * @param bool   $strict       Whether to limit the sanitization to specific characters.
2117       */
2118      return apply_filters( 'sanitize_user', $username, $raw_username, $strict );
2119  }
2120  
2121  /**
2122   * Sanitizes a string key.
2123   *
2124   * Keys are used as internal identifiers. Lowercase alphanumeric characters,
2125   * dashes, and underscores are allowed.
2126   *
2127   * @since 3.0.0
2128   *
2129   * @param string $key String key
2130   * @return string Sanitized key
2131   */
2132  function sanitize_key( $key ) {
2133      $raw_key = $key;
2134      $key     = strtolower( $key );
2135      $key     = preg_replace( '/[^a-z0-9_\-]/', '', $key );
2136  
2137      /**
2138       * Filters a sanitized key string.
2139       *
2140       * @since 3.0.0
2141       *
2142       * @param string $key     Sanitized key.
2143       * @param string $raw_key The key prior to sanitization.
2144       */
2145      return apply_filters( 'sanitize_key', $key, $raw_key );
2146  }
2147  
2148  /**
2149   * Sanitizes a string into a slug, which can be used in URLs or HTML attributes.
2150   *
2151   * By default, converts accent characters to ASCII characters and further
2152   * limits the output to alphanumeric characters, underscore (_) and dash (-)
2153   * through the {@see 'sanitize_title'} filter.
2154   *
2155   * If `$title` is empty and `$fallback_title` is set, the latter will be used.
2156   *
2157   * @since 1.0.0
2158   *
2159   * @param string $title          The string to be sanitized.
2160   * @param string $fallback_title Optional. A title to use if $title is empty. Default empty.
2161   * @param string $context        Optional. The operation for which the string is sanitized.
2162   *                               Default 'save'.
2163   * @return string The sanitized string.
2164   */
2165  function sanitize_title( $title, $fallback_title = '', $context = 'save' ) {
2166      $raw_title = $title;
2167  
2168      if ( 'save' === $context ) {
2169          $title = remove_accents( $title );
2170      }
2171  
2172      /**
2173       * Filters a sanitized title string.
2174       *
2175       * @since 1.2.0
2176       *
2177       * @param string $title     Sanitized title.
2178       * @param string $raw_title The title prior to sanitization.
2179       * @param string $context   The context for which the title is being sanitized.
2180       */
2181      $title = apply_filters( 'sanitize_title', $title, $raw_title, $context );
2182  
2183      if ( '' === $title || false === $title ) {
2184          $title = $fallback_title;
2185      }
2186  
2187      return $title;
2188  }
2189  
2190  /**
2191   * Sanitizes a title with the 'query' context.
2192   *
2193   * Used for querying the database for a value from URL.
2194   *
2195   * @since 3.1.0
2196   *
2197   * @param string $title The string to be sanitized.
2198   * @return string The sanitized string.
2199   */
2200  function sanitize_title_for_query( $title ) {
2201      return sanitize_title( $title, '', 'query' );
2202  }
2203  
2204  /**
2205   * Sanitizes a title, replacing whitespace and a few other characters with dashes.
2206   *
2207   * Limits the output to alphanumeric characters, underscore (_) and dash (-).
2208   * Whitespace becomes a dash.
2209   *
2210   * @since 1.2.0
2211   *
2212   * @param string $title     The title to be sanitized.
2213   * @param string $raw_title Optional. Not used. Default empty.
2214   * @param string $context   Optional. The operation for which the string is sanitized.
2215   *                          Default 'display'.
2216   * @return string The sanitized title.
2217   */
2218  function sanitize_title_with_dashes( $title, $raw_title = '', $context = 'display' ) {
2219      $title = strip_tags( $title );
2220      // Preserve escaped octets.
2221      $title = preg_replace( '|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title );
2222      // Remove percent signs that are not part of an octet.
2223      $title = str_replace( '%', '', $title );
2224      // Restore octets.
2225      $title = preg_replace( '|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title );
2226  
2227      if ( seems_utf8( $title ) ) {
2228          if ( function_exists( 'mb_strtolower' ) ) {
2229              $title = mb_strtolower( $title, 'UTF-8' );
2230          }
2231          $title = utf8_uri_encode( $title, 200 );
2232      }
2233  
2234      $title = strtolower( $title );
2235  
2236      if ( 'save' === $context ) {
2237          // Convert &nbsp, &ndash, and &mdash to hyphens.
2238          $title = str_replace( array( '%c2%a0', '%e2%80%93', '%e2%80%94' ), '-', $title );
2239          // Convert &nbsp, &ndash, and &mdash HTML entities to hyphens.
2240          $title = str_replace( array( '&nbsp;', '&#160;', '&ndash;', '&#8211;', '&mdash;', '&#8212;' ), '-', $title );
2241          // Convert forward slash to hyphen.
2242          $title = str_replace( '/', '-', $title );
2243  
2244          // Strip these characters entirely.
2245          $title = str_replace(
2246              array(
2247                  // Soft hyphens.
2248                  '%c2%ad',
2249                  // &iexcl and &iquest.
2250                  '%c2%a1',
2251                  '%c2%bf',
2252                  // Angle quotes.
2253                  '%c2%ab',
2254                  '%c2%bb',
2255                  '%e2%80%b9',
2256                  '%e2%80%ba',
2257                  // Curly quotes.
2258                  '%e2%80%98',
2259                  '%e2%80%99',
2260                  '%e2%80%9c',
2261                  '%e2%80%9d',
2262                  '%e2%80%9a',
2263                  '%e2%80%9b',
2264                  '%e2%80%9e',
2265                  '%e2%80%9f',
2266                  // &copy, &reg, &deg, &hellip, and &trade.
2267                  '%c2%a9',
2268                  '%c2%ae',
2269                  '%c2%b0',
2270                  '%e2%80%a6',
2271                  '%e2%84%a2',
2272                  // Acute accents.
2273                  '%c2%b4',
2274                  '%cb%8a',
2275                  '%cc%81',
2276                  '%cd%81',
2277                  // Grave accent, macron, caron.
2278                  '%cc%80',
2279                  '%cc%84',
2280                  '%cc%8c',
2281              ),
2282              '',
2283              $title
2284          );
2285  
2286          // Convert &times to 'x'.
2287          $title = str_replace( '%c3%97', 'x', $title );
2288      }
2289  
2290      // Kill entities.
2291      $title = preg_replace( '/&.+?;/', '', $title );
2292      $title = str_replace( '.', '-', $title );
2293  
2294      $title = preg_replace( '/[^%a-z0-9 _-]/', '', $title );
2295      $title = preg_replace( '/\s+/', '-', $title );
2296      $title = preg_replace( '|-+|', '-', $title );
2297      $title = trim( $title, '-' );
2298  
2299      return $title;
2300  }
2301  
2302  /**
2303   * Ensures a string is a valid SQL 'order by' clause.
2304   *
2305   * Accepts one or more columns, with or without a sort order (ASC / DESC).
2306   * e.g. 'column_1', 'column_1, column_2', 'column_1 ASC, column_2 DESC' etc.
2307   *
2308   * Also accepts 'RAND()'.
2309   *
2310   * @since 2.5.1
2311   *
2312   * @param string $orderby Order by clause to be validated.
2313   * @return string|false Returns $orderby if valid, false otherwise.
2314   */
2315  function sanitize_sql_orderby( $orderby ) {
2316      if ( preg_match( '/^\s*(([a-z0-9_]+|`[a-z0-9_]+`)(\s+(ASC|DESC))?\s*(,\s*(?=[a-z0-9_`])|$))+$/i', $orderby ) || preg_match( '/^\s*RAND\(\s*\)\s*$/i', $orderby ) ) {
2317          return $orderby;
2318      }
2319      return false;
2320  }
2321  
2322  /**
2323   * Sanitizes an HTML classname to ensure it only contains valid characters.
2324   *
2325   * Strips the string down to A-Z,a-z,0-9,_,-. If this results in an empty
2326   * string then it will return the alternative value supplied.
2327   *
2328   * @todo Expand to support the full range of CDATA that a class attribute can contain.
2329   *
2330   * @since 2.8.0
2331   *
2332   * @param string $class    The classname to be sanitized
2333   * @param string $fallback Optional. The value to return if the sanitization ends up as an empty string.
2334   *  Defaults to an empty string.
2335   * @return string The sanitized value
2336   */
2337  function sanitize_html_class( $class, $fallback = '' ) {
2338      // Strip out any %-encoded octets.
2339      $sanitized = preg_replace( '|%[a-fA-F0-9][a-fA-F0-9]|', '', $class );
2340  
2341      // Limit to A-Z, a-z, 0-9, '_', '-'.
2342      $sanitized = preg_replace( '/[^A-Za-z0-9_-]/', '', $sanitized );
2343  
2344      if ( '' === $sanitized && $fallback ) {
2345          return sanitize_html_class( $fallback );
2346      }
2347      /**
2348       * Filters a sanitized HTML class string.
2349       *
2350       * @since 2.8.0
2351       *
2352       * @param string $sanitized The sanitized HTML class.
2353       * @param string $class     HTML class before sanitization.
2354       * @param string $fallback  The fallback string.
2355       */
2356      return apply_filters( 'sanitize_html_class', $sanitized, $class, $fallback );
2357  }
2358  
2359  /**
2360   * Converts lone & characters into `&#038;` (a.k.a. `&amp;`)
2361   *
2362   * @since 0.71
2363   *
2364   * @param string $content    String of characters to be converted.
2365   * @param string $deprecated Not used.
2366   * @return string Converted string.
2367   */
2368  function convert_chars( $content, $deprecated = '' ) {
2369      if ( ! empty( $deprecated ) ) {
2370          _deprecated_argument( __FUNCTION__, '0.71' );
2371      }
2372  
2373      if ( strpos( $content, '&' ) !== false ) {
2374          $content = preg_replace( '/&([^#])(?![a-z1-4]{1,8};)/i', '&#038;$1', $content );
2375      }
2376  
2377      return $content;
2378  }
2379  
2380  /**
2381   * Converts invalid Unicode references range to valid range.
2382   *
2383   * @since 4.3.0
2384   *
2385   * @param string $content String with entities that need converting.
2386   * @return string Converted string.
2387   */
2388  function convert_invalid_entities( $content ) {
2389      $wp_htmltranswinuni = array(
2390          '&#128;' => '&#8364;', // The Euro sign.
2391          '&#129;' => '',
2392          '&#130;' => '&#8218;', // These are Windows CP1252 specific characters.
2393          '&#131;' => '&#402;',  // They would look weird on non-Windows browsers.
2394          '&#132;' => '&#8222;',
2395          '&#133;' => '&#8230;',
2396          '&#134;' => '&#8224;',
2397          '&#135;' => '&#8225;',
2398          '&#136;' => '&#710;',
2399          '&#137;' => '&#8240;',
2400          '&#138;' => '&#352;',
2401          '&#139;' => '&#8249;',
2402          '&#140;' => '&#338;',
2403          '&#141;' => '',
2404          '&#142;' => '&#381;',
2405          '&#143;' => '',
2406          '&#144;' => '',
2407          '&#145;' => '&#8216;',
2408          '&#146;' => '&#8217;',
2409          '&#147;' => '&#8220;',
2410          '&#148;' => '&#8221;',
2411          '&#149;' => '&#8226;',
2412          '&#150;' => '&#8211;',
2413          '&#151;' => '&#8212;',
2414          '&#152;' => '&#732;',
2415          '&#153;' => '&#8482;',
2416          '&#154;' => '&#353;',
2417          '&#155;' => '&#8250;',
2418          '&#156;' => '&#339;',
2419          '&#157;' => '',
2420          '&#158;' => '&#382;',
2421          '&#159;' => '&#376;',
2422      );
2423  
2424      if ( strpos( $content, '&#1' ) !== false ) {
2425          $content = strtr( $content, $wp_htmltranswinuni );
2426      }
2427  
2428      return $content;
2429  }
2430  
2431  /**
2432   * Balances tags if forced to, or if the 'use_balanceTags' option is set to true.
2433   *
2434   * @since 0.71
2435   *
2436   * @param string $text  Text to be balanced
2437   * @param bool   $force If true, forces balancing, ignoring the value of the option. Default false.
2438   * @return string Balanced text
2439   */
2440  function balanceTags( $text, $force = false ) {  // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
2441      if ( $force || (int) get_option( 'use_balanceTags' ) === 1 ) {
2442          return force_balance_tags( $text );
2443      } else {
2444          return $text;
2445      }
2446  }
2447  
2448  /**
2449   * Balances tags of string using a modified stack.
2450   *
2451   * @since 2.0.4
2452   * @since 5.3.0 Improve accuracy and add support for custom element tags.
2453   *
2454   * @author Leonard Lin <leonard@acm.org>
2455   * @license GPL
2456   * @copyright November 4, 2001
2457   * @version 1.1
2458   * @todo Make better - change loop condition to $text in 1.2
2459   * @internal Modified by Scott Reilly (coffee2code) 02 Aug 2004
2460   *      1.1  Fixed handling of append/stack pop order of end text
2461   *           Added Cleaning Hooks
2462   *      1.0  First Version
2463   *
2464   * @param string $text Text to be balanced.
2465   * @return string Balanced text.
2466   */
2467  function force_balance_tags( $text ) {
2468      $tagstack  = array();
2469      $stacksize = 0;
2470      $tagqueue  = '';
2471      $newtext   = '';
2472      // Known single-entity/self-closing tags.
2473      $single_tags = array( 'area', 'base', 'basefont', 'br', 'col', 'command', 'embed', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param', 'source' );
2474      // Tags that can be immediately nested within themselves.
2475      $nestable_tags = array( 'blockquote', 'div', 'object', 'q', 'span' );
2476  
2477      // WP bug fix for comments - in case you REALLY meant to type '< !--'.
2478      $text = str_replace( '< !--', '<    !--', $text );
2479      // WP bug fix for LOVE <3 (and other situations with '<' before a number).
2480      $text = preg_replace( '#<([0-9]{1})#', '&lt;$1', $text );
2481  
2482      /**
2483       * Matches supported tags.
2484       *
2485       * To get the pattern as a string without the comments paste into a PHP
2486       * REPL like `php -a`.
2487       *
2488       * @see https://html.spec.whatwg.org/#elements-2
2489       * @see https://w3c.github.io/webcomponents/spec/custom/#valid-custom-element-name
2490       *
2491       * @example
2492       * ~# php -a
2493       * php > $s = [paste copied contents of expression below including parentheses];
2494       * php > echo $s;
2495       */
2496      $tag_pattern = (
2497          '#<' . // Start with an opening bracket.
2498          '(/?)' . // Group 1 - If it's a closing tag it'll have a leading slash.
2499          '(' . // Group 2 - Tag name.
2500              // Custom element tags have more lenient rules than HTML tag names.
2501              '(?:[a-z](?:[a-z0-9._]*)-(?:[a-z0-9._-]+)+)' .
2502                  '|' .
2503              // Traditional tag rules approximate HTML tag names.
2504              '(?:[\w:]+)' .
2505          ')' .
2506          '(?:' .
2507              // We either immediately close the tag with its '>' and have nothing here.
2508              '\s*' .
2509              '(/?)' . // Group 3 - "attributes" for empty tag.
2510                  '|' .
2511              // Or we must start with space characters to separate the tag name from the attributes (or whitespace).
2512              '(\s+)' . // Group 4 - Pre-attribute whitespace.
2513              '([^>]*)' . // Group 5 - Attributes.
2514          ')' .
2515          '>#' // End with a closing bracket.
2516      );
2517  
2518      while ( preg_match( $tag_pattern, $text, $regex ) ) {
2519          $full_match        = $regex[0];
2520          $has_leading_slash = ! empty( $regex[1] );
2521          $tag_name          = $regex[2];
2522          $tag               = strtolower( $tag_name );
2523          $is_single_tag     = in_array( $tag, $single_tags, true );
2524          $pre_attribute_ws  = isset( $regex[4] ) ? $regex[4] : '';
2525          $attributes        = trim( isset( $regex[5] ) ? $regex[5] : $regex[3] );
2526          $has_self_closer   = '/' === substr( $attributes, -1 );
2527  
2528          $newtext .= $tagqueue;
2529  
2530          $i = strpos( $text, $full_match );
2531          $l = strlen( $full_match );
2532  
2533          // Clear the shifter.
2534          $tagqueue = '';
2535          if ( $has_leading_slash ) { // End tag.
2536              // If too many closing tags.
2537              if ( $stacksize <= 0 ) {
2538                  $tag = '';
2539                  // Or close to be safe $tag = '/' . $tag.
2540  
2541                  // If stacktop value = tag close value, then pop.
2542              } elseif ( $tagstack[ $stacksize - 1 ] === $tag ) { // Found closing tag.
2543                  $tag = '</' . $tag . '>'; // Close tag.
2544                  array_pop( $tagstack );
2545                  $stacksize--;
2546              } else { // Closing tag not at top, search for it.
2547                  for ( $j = $stacksize - 1; $j >= 0; $j-- ) {
2548                      if ( $tagstack[ $j ] === $tag ) {
2549                          // Add tag to tagqueue.
2550                          for ( $k = $stacksize - 1; $k >= $j; $k-- ) {
2551                              $tagqueue .= '</' . array_pop( $tagstack ) . '>';
2552                              $stacksize--;
2553                          }
2554                          break;
2555                      }
2556                  }
2557                  $tag = '';
2558              }
2559          } else { // Begin tag.
2560              if ( $has_self_closer ) { // If it presents itself as a self-closing tag...
2561                  // ...but it isn't a known single-entity self-closing tag, then don't let it be treated as such
2562                  // and immediately close it with a closing tag (the tag will encapsulate no text as a result).
2563                  if ( ! $is_single_tag ) {
2564                      $attributes = trim( substr( $attributes, 0, -1 ) ) . "></$tag";
2565                  }
2566              } elseif ( $is_single_tag ) { // Else if it's a known single-entity tag but it doesn't close itself, do so.
2567                  $pre_attribute_ws = ' ';
2568                  $attributes      .= '/';
2569              } else { // It's not a single-entity tag.
2570                  // If the top of the stack is the same as the tag we want to push, close previous tag.
2571                  if ( $stacksize > 0 && ! in_array( $tag, $nestable_tags, true ) && $tagstack[ $stacksize - 1 ] === $tag ) {
2572                      $tagqueue = '</' . array_pop( $tagstack ) . '>';
2573                      $stacksize--;
2574                  }
2575                  $stacksize = array_push( $tagstack, $tag );
2576              }
2577  
2578              // Attributes.
2579              if ( $has_self_closer && $is_single_tag ) {
2580                  // We need some space - avoid <br/> and prefer <br />.
2581                  $pre_attribute_ws = ' ';
2582              }
2583  
2584              $tag = '<' . $tag . $pre_attribute_ws . $attributes . '>';
2585              // If already queuing a close tag, then put this tag on too.
2586              if ( ! empty( $tagqueue ) ) {
2587                  $tagqueue .= $tag;
2588                  $tag       = '';
2589              }
2590          }
2591          $newtext .= substr( $text, 0, $i ) . $tag;
2592          $text     = substr( $text, $i + $l );
2593      }
2594  
2595      // Clear tag queue.
2596      $newtext .= $tagqueue;
2597  
2598      // Add remaining text.
2599      $newtext .= $text;
2600  
2601      while ( $x = array_pop( $tagstack ) ) {
2602          $newtext .= '</' . $x . '>'; // Add remaining tags to close.
2603      }
2604  
2605      // WP fix for the bug with HTML comments.
2606      $newtext = str_replace( '< !--', '<!--', $newtext );
2607      $newtext = str_replace( '<    !--', '< !--', $newtext );
2608  
2609      return $newtext;
2610  }
2611  
2612  /**
2613   * Acts on text which is about to be edited.
2614   *
2615   * The $content is run through esc_textarea(), which uses htmlspecialchars()
2616   * to convert special characters to HTML entities. If `$richedit` is set to true,
2617   * it is simply a holder for the {@see 'format_to_edit'} filter.
2618   *
2619   * @since 0.71
2620   * @since 4.4.0 The `$richedit` parameter was renamed to `$rich_text` for clarity.
2621   *
2622   * @param string $content   The text about to be edited.
2623   * @param bool   $rich_text Optional. Whether `$content` should be considered rich text,
2624   *                          in which case it would not be passed through esc_textarea().
2625   *                          Default false.
2626   * @return string The text after the filter (and possibly htmlspecialchars()) has been run.
2627   */
2628  function format_to_edit( $content, $rich_text = false ) {
2629      /**
2630       * Filters the text to be formatted for editing.
2631       *
2632       * @since 1.2.0
2633       *
2634       * @param string $content The text, prior to formatting for editing.
2635       */
2636      $content = apply_filters( 'format_to_edit', $content );
2637      if ( ! $rich_text ) {
2638          $content = esc_textarea( $content );
2639      }
2640      return $content;
2641  }
2642  
2643  /**
2644   * Add leading zeros when necessary.
2645   *
2646   * If you set the threshold to '4' and the number is '10', then you will get
2647   * back '0010'. If you set the threshold to '4' and the number is '5000', then you
2648   * will get back '5000'.
2649   *
2650   * Uses sprintf to append the amount of zeros based on the $threshold parameter
2651   * and the size of the number. If the number is large enough, then no zeros will
2652   * be appended.
2653   *
2654   * @since 0.71
2655   *
2656   * @param int $number     Number to append zeros to if not greater than threshold.
2657   * @param int $threshold  Digit places number needs to be to not have zeros added.
2658   * @return string Adds leading zeros to number if needed.
2659   */
2660  function zeroise( $number, $threshold ) {
2661      return sprintf( '%0' . $threshold . 's', $number );
2662  }
2663  
2664  /**
2665   * Adds backslashes before letters and before a number at the start of a string.
2666   *
2667   * @since 0.71
2668   *
2669   * @param string $string Value to which backslashes will be added.
2670   * @return string String with backslashes inserted.
2671   */
2672  function backslashit( $string ) {
2673      if ( isset( $string[0] ) && $string[0] >= '0' && $string[0] <= '9' ) {
2674          $string = '\\\\' . $string;
2675      }
2676      return addcslashes( $string, 'A..Za..z' );
2677  }
2678  
2679  /**
2680   * Appends a trailing slash.
2681   *
2682   * Will remove trailing forward and backslashes if it exists already before adding
2683   * a trailing forward slash. This prevents double slashing a string or path.
2684   *
2685   * The primary use of this is for paths and thus should be used for paths. It is
2686   * not restricted to paths and offers no specific path support.
2687   *
2688   * @since 1.2.0
2689   *
2690   * @param string $string What to add the trailing slash to.
2691   * @return string String with trailing slash added.
2692   */
2693  function trailingslashit( $string ) {
2694      return untrailingslashit( $string ) . '/';
2695  }
2696  
2697  /**
2698   * Removes trailing forward slashes and backslashes if they exist.
2699   *
2700   * The primary use of this is for paths and thus should be used for paths. It is
2701   * not restricted to paths and offers no specific path support.
2702   *
2703   * @since 2.2.0
2704   *
2705   * @param string $string What to remove the trailing slashes from.
2706   * @return string String without the trailing slashes.
2707   */
2708  function untrailingslashit( $string ) {
2709      return rtrim( $string, '/\\' );
2710  }
2711  
2712  /**
2713   * Adds slashes to escape strings.
2714   *
2715   * Slashes will first be removed if magic_quotes_gpc is set, see {@link
2716   * https://www.php.net/magic_quotes} for more details.
2717   *
2718   * @since 0.71
2719   *
2720   * @param string $gpc The string returned from HTTP request data.
2721   * @return string Returns a string escaped with slashes.
2722   */
2723  function addslashes_gpc( $gpc ) {
2724      return wp_slash( $gpc );
2725  }
2726  
2727  /**
2728   * Navigates through an array, object, or scalar, and removes slashes from the values.
2729   *
2730   * @since 2.0.0
2731   *
2732   * @param mixed $value The value to be stripped.
2733   * @return mixed Stripped value.
2734   */
2735  function stripslashes_deep( $value ) {
2736      return map_deep( $value, 'stripslashes_from_strings_only' );
2737  }
2738  
2739  /**
2740   * Callback function for `stripslashes_deep()` which strips slashes from strings.
2741   *
2742   * @since 4.4.0
2743   *
2744   * @param mixed $value The array or string to be stripped.
2745   * @return mixed The stripped value.
2746   */
2747  function stripslashes_from_strings_only( $value ) {
2748      return is_string( $value ) ? stripslashes( $value ) : $value;
2749  }
2750  
2751  /**
2752   * Navigates through an array, object, or scalar, and encodes the values to be used in a URL.
2753   *
2754   * @since 2.2.0
2755   *
2756   * @param mixed $value The array or string to be encoded.
2757   * @return mixed The encoded value.
2758   */
2759  function urlencode_deep( $value ) {
2760      return map_deep( $value, 'urlencode' );
2761  }
2762  
2763  /**
2764   * Navigates through an array, object, or scalar, and raw-encodes the values to be used in a URL.
2765   *
2766   * @since 3.4.0
2767   *
2768   * @param mixed $value The array or string to be encoded.
2769   * @return mixed The encoded value.
2770   */
2771  function rawurlencode_deep( $value ) {
2772      return map_deep( $value, 'rawurlencode' );
2773  }
2774  
2775  /**
2776   * Navigates through an array, object, or scalar, and decodes URL-encoded values
2777   *
2778   * @since 4.4.0
2779   *
2780   * @param mixed $value The array or string to be decoded.
2781   * @return mixed The decoded value.
2782   */
2783  function urldecode_deep( $value ) {
2784      return map_deep( $value, 'urldecode' );
2785  }
2786  
2787  /**
2788   * Converts email addresses characters to HTML entities to block spam bots.
2789   *
2790   * @since 0.71
2791   *
2792   * @param string $email_address Email address.
2793   * @param int    $hex_encoding  Optional. Set to 1 to enable hex encoding.
2794   * @return string Converted email address.
2795   */
2796  function antispambot( $email_address, $hex_encoding = 0 ) {
2797      $email_no_spam_address = '';
2798      for ( $i = 0, $len = strlen( $email_address ); $i < $len; $i++ ) {
2799          $j = rand( 0, 1 + $hex_encoding );
2800          if ( 0 == $j ) {
2801              $email_no_spam_address .= '&#' . ord( $email_address[ $i ] ) . ';';
2802          } elseif ( 1 == $j ) {
2803              $email_no_spam_address .= $email_address[ $i ];
2804          } elseif ( 2 == $j ) {
2805              $email_no_spam_address .= '%' . zeroise( dechex( ord( $email_address[ $i ] ) ), 2 );
2806          }
2807      }
2808  
2809      return str_replace( '@', '&#64;', $email_no_spam_address );
2810  }
2811  
2812  /**
2813   * Callback to convert URI match to HTML A element.
2814   *
2815   * This function was backported from 2.5.0 to 2.3.2. Regex callback for make_clickable().
2816   *
2817   * @since 2.3.2
2818   * @access private
2819   *
2820   * @param array $matches Single Regex Match.
2821   * @return string HTML A element with URI address.
2822   */
2823  function _make_url_clickable_cb( $matches ) {
2824      $url = $matches[2];
2825  
2826      if ( ')' === $matches[3] && strpos( $url, '(' ) ) {
2827          // If the trailing character is a closing parethesis, and the URL has an opening parenthesis in it,
2828          // add the closing parenthesis to the URL. Then we can let the parenthesis balancer do its thing below.
2829          $url   .= $matches[3];
2830          $suffix = '';
2831      } else {
2832          $suffix = $matches[3];
2833      }
2834  
2835      // Include parentheses in the URL only if paired.
2836      while ( substr_count( $url, '(' ) < substr_count( $url, ')' ) ) {
2837          $suffix = strrchr( $url, ')' ) . $suffix;
2838          $url    = substr( $url, 0, strrpos( $url, ')' ) );
2839      }
2840  
2841      $url = esc_url( $url );
2842      if ( empty( $url ) ) {
2843          return $matches[0];
2844      }
2845  
2846      if ( 'comment_text' === current_filter() ) {
2847          $rel = 'nofollow ugc';
2848      } else {
2849          $rel = 'nofollow';
2850      }
2851  
2852      /**
2853       * Filters the rel value that is added to URL matches converted to links.
2854       *
2855       * @since 5.3.0
2856       *
2857       * @param string $rel The rel value.
2858       * @param string $url The matched URL being converted to a link tag.
2859       */
2860      $rel = apply_filters( 'make_clickable_rel', $rel, $url );
2861      $rel = esc_attr( $rel );
2862  
2863      return $matches[1] . "<a href=\"$url\" rel=\"$rel\">$url</a>" . $suffix;
2864  }
2865  
2866  /**
2867   * Callback to convert URL match to HTML A element.
2868   *
2869   * This function was backported from 2.5.0 to 2.3.2. Regex callback for make_clickable().
2870   *
2871   * @since 2.3.2
2872   * @access private
2873   *
2874   * @param array $matches Single Regex Match.
2875   * @return string HTML A element with URL address.
2876   */
2877  function _make_web_ftp_clickable_cb( $matches ) {
2878      $ret  = '';
2879      $dest = $matches[2];
2880      $dest = 'http://' . $dest;
2881  
2882      // Removed trailing [.,;:)] from URL.
2883      $last_char = substr( $dest, -1 );
2884      if ( in_array( $last_char, array( '.', ',', ';', ':', ')' ), true ) === true ) {
2885          $ret  = $last_char;
2886          $dest = substr( $dest, 0, strlen( $dest ) - 1 );
2887      }
2888  
2889      $dest = esc_url( $dest );
2890      if ( empty( $dest ) ) {
2891          return $matches[0];
2892      }
2893  
2894      if ( 'comment_text' === current_filter() ) {
2895          $rel = 'nofollow ugc';
2896      } else {
2897          $rel = 'nofollow';
2898      }
2899  
2900      /** This filter is documented in wp-includes/formatting.php */
2901      $rel = apply_filters( 'make_clickable_rel', $rel, $dest );
2902      $rel = esc_attr( $rel );
2903  
2904      return $matches[1] . "<a href=\"$dest\" rel=\"$rel\">$dest</a>$ret";
2905  }
2906  
2907  /**
2908   * Callback to convert email address match to HTML A element.
2909   *
2910   * This function was backported from 2.5.0 to 2.3.2. Regex callback for make_clickable().
2911   *
2912   * @since 2.3.2
2913   * @access private
2914   *
2915   * @param array $matches Single Regex Match.
2916   * @return string HTML A element with email address.
2917   */
2918  function _make_email_clickable_cb( $matches ) {
2919      $email = $matches[2] . '@' . $matches[3];
2920      return $matches[1] . "<a href=\"mailto:$email\">$email</a>";
2921  }
2922  
2923  /**
2924   * Convert plaintext URI to HTML links.
2925   *
2926   * Converts URI, www and ftp, and email addresses. Finishes by fixing links
2927   * within links.
2928   *
2929   * @since 0.71
2930   *
2931   * @param string $text Content to convert URIs.
2932   * @return string Content with converted URIs.
2933   */
2934  function make_clickable( $text ) {
2935      $r               = '';
2936      $textarr         = preg_split( '/(<[^<>]+>)/', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // Split out HTML tags.
2937      $nested_code_pre = 0; // Keep track of how many levels link is nested inside <pre> or <code>.
2938      foreach ( $textarr as $piece ) {
2939  
2940          if ( preg_match( '|^<code[\s>]|i', $piece ) || preg_match( '|^<pre[\s>]|i', $piece ) || preg_match( '|^<script[\s>]|i', $piece ) || preg_match( '|^<style[\s>]|i', $piece ) ) {
2941              $nested_code_pre++;
2942          } elseif ( $nested_code_pre && ( '</code>' === strtolower( $piece ) || '</pre>' === strtolower( $piece ) || '</script>' === strtolower( $piece ) || '</style>' === strtolower( $piece ) ) ) {
2943              $nested_code_pre--;
2944          }
2945  
2946          if ( $nested_code_pre || empty( $piece ) || ( '<' === $piece[0] && ! preg_match( '|^<\s*[\w]{1,20}+://|', $piece ) ) ) {
2947              $r .= $piece;
2948              continue;
2949          }
2950  
2951          // Long strings might contain expensive edge cases...
2952          if ( 10000 < strlen( $piece ) ) {
2953              // ...break it up.
2954              foreach ( _split_str_by_whitespace( $piece, 2100 ) as $chunk ) { // 2100: Extra room for scheme and leading and trailing paretheses.
2955                  if ( 2101 < strlen( $chunk ) ) {
2956                      $r .= $chunk; // Too big, no whitespace: bail.
2957                  } else {
2958                      $r .= make_clickable( $chunk );
2959                  }
2960              }
2961          } else {
2962              $ret = " $piece "; // Pad with whitespace to simplify the regexes.
2963  
2964              $url_clickable = '~
2965                  ([\\s(<.,;:!?])                                # 1: Leading whitespace, or punctuation.
2966                  (                                              # 2: URL.
2967                      [\\w]{1,20}+://                                # Scheme and hier-part prefix.
2968                      (?=\S{1,2000}\s)                               # Limit to URLs less than about 2000 characters long.
2969                      [\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]*+         # Non-punctuation URL character.
2970                      (?:                                            # Unroll the Loop: Only allow puctuation URL character if followed by a non-punctuation URL character.
2971                          [\'.,;:!?)]                                    # Punctuation URL character.
2972                          [\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]++         # Non-punctuation URL character.
2973                      )*
2974                  )
2975                  (\)?)                                          # 3: Trailing closing parenthesis (for parethesis balancing post processing).
2976              ~xS';
2977              // The regex is a non-anchored pattern and does not have a single fixed starting character.
2978              // Tell PCRE to spend more time optimizing since, when used on a page load, it will probably be used several times.
2979  
2980              $ret = preg_replace_callback( $url_clickable, '_make_url_clickable_cb', $ret );
2981  
2982              $ret = preg_replace_callback( '#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]+)#is', '_make_web_ftp_clickable_cb', $ret );
2983              $ret = preg_replace_callback( '#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret );
2984  
2985              $ret = substr( $ret, 1, -1 ); // Remove our whitespace padding.
2986              $r  .= $ret;
2987          }
2988      }
2989  
2990      // Cleanup of accidental links within links.
2991      return preg_replace( '#(<a([ \r\n\t]+[^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i', '$1$3</a>', $r );
2992  }
2993  
2994  /**
2995   * Breaks a string into chunks by splitting at whitespace characters.
2996   * The length of each returned chunk is as close to the specified length goal as possible,
2997   * with the caveat that each chunk includes its trailing delimiter.
2998   * Chunks longer than the goal are guaranteed to not have any inner whitespace.
2999   *
3000   * Joining the returned chunks with empty delimiters reconstructs the input string losslessly.
3001   *
3002   * Input string must have no null characters (or eventual transformations on output chunks must not care about null characters)
3003   *
3004   *     _split_str_by_whitespace( "1234 67890 1234 67890a cd 1234   890 123456789 1234567890a    45678   1 3 5 7 90 ", 10 ) ==
3005   *     array (
3006   *         0 => '1234 67890 ',  // 11 characters: Perfect split.
3007   *         1 => '1234 ',        //  5 characters: '1234 67890a' was too long.
3008   *         2 => '67890a cd ',   // 10 characters: '67890a cd 1234' was too long.
3009   *         3 => '1234   890 ',  // 11 characters: Perfect split.
3010   *         4 => '123456789 ',   // 10 characters: '123456789 1234567890a' was too long.
3011   *         5 => '1234567890a ', // 12 characters: Too long, but no inner whitespace on which to split.
3012   *         6 => '   45678   ',  // 11 characters: Perfect split.
3013   *         7 => '1 3 5 7 90 ',  // 11 characters: End of $string.
3014   *     );
3015   *
3016   * @since 3.4.0
3017   * @access private
3018   *
3019   * @param string $string The string to split.
3020   * @param int    $goal   The desired chunk length.
3021   * @return array Numeric array of chunks.
3022   */
3023  function _split_str_by_whitespace( $string, $goal ) {
3024      $chunks = array();
3025  
3026      $string_nullspace = strtr( $string, "\r\n\t\v\f ", "\000\000\000\000\000\000" );
3027  
3028      while ( $goal < strlen( $string_nullspace ) ) {
3029          $pos = strrpos( substr( $string_nullspace, 0, $goal + 1 ), "\000" );
3030  
3031          if ( false === $pos ) {
3032              $pos = strpos( $string_nullspace, "\000", $goal + 1 );
3033              if ( false === $pos ) {
3034                  break;
3035              }
3036          }
3037  
3038          $chunks[]         = substr( $string, 0, $pos + 1 );
3039          $string           = substr( $string, $pos + 1 );
3040          $string_nullspace = substr( $string_nullspace, $pos + 1 );
3041      }
3042  
3043      if ( $string ) {
3044          $chunks[] = $string;
3045      }
3046  
3047      return $chunks;
3048  }
3049  
3050  /**
3051   * Callback to add a rel attribute to HTML A element.
3052   *
3053   * Will remove already existing string before adding to prevent invalidating (X)HTML.
3054   *
3055   * @since 5.3.0
3056   *
3057   * @param array  $matches Single match.
3058   * @param string $rel     The rel attribute to add.
3059   * @return string HTML A element with the added rel attribute.
3060   */
3061  function wp_rel_callback( $matches, $rel ) {
3062      $text = $matches[1];
3063      $atts = wp_kses_hair( $matches[1], wp_allowed_protocols() );
3064  
3065      if ( ! empty( $atts['href'] ) ) {
3066          if ( in_array( strtolower( wp_parse_url( $atts['href']['value'], PHP_URL_SCHEME ) ), array( 'http', 'https' ), true ) ) {
3067              if ( strtolower( wp_parse_url( $atts['href']['value'], PHP_URL_HOST ) ) === strtolower( wp_parse_url( home_url(), PHP_URL_HOST ) ) ) {
3068                  return "<a $text>";
3069              }
3070          }
3071      }
3072  
3073      if ( ! empty( $atts['rel'] ) ) {
3074          $parts     = array_map( 'trim', explode( ' ', $atts['rel']['value'] ) );
3075          $rel_array = array_map( 'trim', explode( ' ', $rel ) );
3076          $parts     = array_unique( array_merge( $parts, $rel_array ) );
3077          $rel       = implode( ' ', $parts );
3078          unset( $atts['rel'] );
3079  
3080          $html = '';
3081          foreach ( $atts as $name => $value ) {
3082              if ( isset( $value['vless'] ) && 'y' === $value['vless'] ) {
3083                  $html .= $name . ' ';
3084              } else {
3085                  $html .= "{$name}=\"" . esc_attr( $value['value'] ) . '" ';
3086              }
3087          }
3088          $text = trim( $html );
3089      }
3090      return "<a $text rel=\"" . esc_attr( $rel ) . '">';
3091  }
3092  
3093  /**
3094   * Adds `rel="nofollow"` string to all HTML A elements in content.
3095   *
3096   * @since 1.5.0
3097   *
3098   * @param string $text Content that may contain HTML A elements.
3099   * @return string Converted content.
3100   */
3101  function wp_rel_nofollow( $text ) {
3102      // This is a pre-save filter, so text is already escaped.
3103      $text = stripslashes( $text );
3104      $text = preg_replace_callback(
3105          '|<a (.+?)>|i',
3106          function( $matches ) {
3107              return wp_rel_callback( $matches, 'nofollow' );
3108          },
3109          $text
3110      );
3111      return wp_slash( $text );
3112  }
3113  
3114  /**
3115   * Callback to add `rel="nofollow"` string to HTML A element.
3116   *
3117   * @since 2.3.0
3118   * @deprecated 5.3.0 Use wp_rel_callback()
3119   *
3120   * @param array $matches Single match.
3121   * @return string HTML A Element with `rel="nofollow"`.
3122   */
3123  function wp_rel_nofollow_callback( $matches ) {
3124      return wp_rel_callback( $matches, 'nofollow' );
3125  }
3126  
3127  /**
3128   * Adds `rel="nofollow ugc"` string to all HTML A elements in content.
3129   *
3130   * @since 5.3.0
3131   *
3132   * @param string $text Content that may contain HTML A elements.
3133   * @return string Converted content.
3134   */
3135  function wp_rel_ugc( $text ) {
3136      // This is a pre-save filter, so text is already escaped.
3137      $text = stripslashes( $text );
3138      $text = preg_replace_callback(
3139          '|<a (.+?)>|i',
3140          function( $matches ) {
3141              return wp_rel_callback( $matches, 'nofollow ugc' );
3142          },
3143          $text
3144      );
3145      return wp_slash( $text );
3146  }
3147  
3148  /**
3149   * Adds rel noreferrer and noopener to all HTML A elements that have a target.
3150   *
3151   * @since 5.1.0
3152   *
3153   * @param string $text Content that may contain HTML A elements.
3154   * @return string Converted content.
3155   */
3156  function wp_targeted_link_rel( $text ) {
3157      // Don't run (more expensive) regex if no links with targets.
3158      if ( stripos( $text, 'target' ) === false || stripos( $text, '<a ' ) === false || is_serialized( $text ) ) {
3159          return $text;
3160      }
3161  
3162      $script_and_style_regex = '/<(script|style).*?<\/\\1>/si';
3163  
3164      preg_match_all( $script_and_style_regex, $text, $matches );
3165      $extra_parts = $matches[0];
3166      $html_parts  = preg_split( $script_and_style_regex, $text );
3167  
3168      foreach ( $html_parts as &$part ) {
3169          $part = preg_replace_callback( '|<a\s([^>]*target\s*=[^>]*)>|i', 'wp_targeted_link_rel_callback', $part );
3170      }
3171  
3172      $text = '';
3173      for ( $i = 0; $i < count( $html_parts ); $i++ ) {
3174          $text .= $html_parts[ $i ];
3175          if ( isset( $extra_parts[ $i ] ) ) {
3176              $text .= $extra_parts[ $i ];
3177          }
3178      }
3179  
3180      return $text;
3181  }
3182  
3183  /**
3184   * Callback to add rel="noreferrer noopener" string to HTML A element.
3185   *
3186   * Will not duplicate existing noreferrer and noopener values
3187   * to prevent from invalidating the HTML.
3188   *
3189   * @since 5.1.0
3190   *
3191   * @param array $matches Single Match
3192   * @return string HTML A Element with rel noreferrer noopener in addition to any existing values
3193   */
3194  function wp_targeted_link_rel_callback( $matches ) {
3195      $link_html          = $matches[1];
3196      $original_link_html = $link_html;
3197  
3198      // Consider the HTML escaped if there are no unescaped quotes.
3199      $is_escaped = ! preg_match( '/(^|[^\\\\])[\'"]/', $link_html );
3200      if ( $is_escaped ) {
3201          // Replace only the quotes so that they are parsable by wp_kses_hair(), leave the rest as is.
3202          $link_html = preg_replace( '/\\\\([\'"])/', '$1', $link_html );
3203      }
3204  
3205      $atts = wp_kses_hair( $link_html, wp_allowed_protocols() );
3206  
3207      /**
3208       * Filters the rel values that are added to links with `target` attribute.
3209       *
3210       * @since 5.1.0
3211       *
3212       * @param string $rel       The rel values.
3213       * @param string $link_html The matched content of the link tag including all HTML attributes.
3214       */
3215      $rel = apply_filters( 'wp_targeted_link_rel', 'noopener noreferrer', $link_html );
3216  
3217      // Return early if no rel values to be added or if no actual target attribute.
3218      if ( ! $rel || ! isset( $atts['target'] ) ) {
3219          return "<a $original_link_html>";
3220      }
3221  
3222      if ( isset( $atts['rel'] ) ) {
3223          $all_parts = preg_split( '/\s/', "{$atts['rel']['value']} $rel", -1, PREG_SPLIT_NO_EMPTY );
3224          $rel       = implode( ' ', array_unique( $all_parts ) );
3225      }
3226  
3227      $atts['rel']['whole'] = 'rel="' . esc_attr( $rel ) . '"';
3228      $link_html            = join( ' ', array_column( $atts, 'whole' ) );
3229  
3230      if ( $is_escaped ) {
3231          $link_html = preg_replace( '/[\'"]/', '\\\\$0', $link_html );
3232      }
3233  
3234      return "<a $link_html>";
3235  }
3236  
3237  /**
3238   * Adds all filters modifying the rel attribute of targeted links.
3239   *
3240   * @since 5.1.0
3241   */
3242  function wp_init_targeted_link_rel_filters() {
3243      $filters = array(
3244          'title_save_pre',
3245          'content_save_pre',
3246          'excerpt_save_pre',
3247          'content_filtered_save_pre',
3248          'pre_comment_content',
3249          'pre_term_description',
3250          'pre_link_description',
3251          'pre_link_notes',
3252          'pre_user_description',
3253      );
3254  
3255      foreach ( $filters as $filter ) {
3256          add_filter( $filter, 'wp_targeted_link_rel' );
3257      };
3258  }
3259  
3260  /**
3261   * Removes all filters modifying the rel attribute of targeted links.
3262   *
3263   * @since 5.1.0
3264   */
3265  function wp_remove_targeted_link_rel_filters() {
3266      $filters = array(
3267          'title_save_pre',
3268          'content_save_pre',
3269          'excerpt_save_pre',
3270          'content_filtered_save_pre',
3271          'pre_comment_content',
3272          'pre_term_description',
3273          'pre_link_description',
3274          'pre_link_notes',
3275          'pre_user_description',
3276      );
3277  
3278      foreach ( $filters as $filter ) {
3279          remove_filter( $filter, 'wp_targeted_link_rel' );
3280      };
3281  }
3282  
3283  /**
3284   * Convert one smiley code to the icon graphic file equivalent.
3285   *
3286   * Callback handler for convert_smilies().
3287   *
3288   * Looks up one smiley code in the $wpsmiliestrans global array and returns an
3289   * `<img>` string for that smiley.
3290   *
3291   * @since 2.8.0
3292   *
3293   * @global array $wpsmiliestrans
3294   *
3295   * @param array $matches Single match. Smiley code to convert to image.
3296   * @return string Image string for smiley.
3297   */
3298  function translate_smiley( $matches ) {
3299      global $wpsmiliestrans;
3300  
3301      if ( count( $matches ) == 0 ) {
3302          return '';
3303      }
3304  
3305      $smiley = trim( reset( $matches ) );
3306      $img    = $wpsmiliestrans[ $smiley ];
3307  
3308      $matches    = array();
3309      $ext        = preg_match( '/\.([^.]+)$/', $img, $matches ) ? strtolower( $matches[1] ) : false;
3310      $image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );
3311  
3312      // Don't convert smilies that aren't images - they're probably emoji.
3313      if ( ! in_array( $ext, $image_exts, true ) ) {
3314          return $img;
3315      }
3316  
3317      /**
3318       * Filters the Smiley image URL before it's used in the image element.
3319       *
3320       * @since 2.9.0
3321       *
3322       * @param string $smiley_url URL for the smiley image.
3323       * @param string $img        Filename for the smiley image.
3324       * @param string $site_url   Site URL, as returned by site_url().
3325       */
3326      $src_url = apply_filters( 'smilies_src', includes_url( "images/smilies/$img" ), $img, site_url() );
3327  
3328      return sprintf( '<img src="%s" alt="%s" class="wp-smiley" style="height: 1em; max-height: 1em;" />', esc_url( $src_url ), esc_attr( $smiley ) );
3329  }
3330  
3331  /**
3332   * Convert text equivalent of smilies to images.
3333   *
3334   * Will only convert smilies if the option 'use_smilies' is true and the global
3335   * used in the function isn't empty.
3336   *
3337   * @since 0.71
3338   *
3339   * @global string|array $wp_smiliessearch
3340   *
3341   * @param string $text Content to convert smilies from text.
3342   * @return string Converted content with text smilies replaced with images.
3343   */
3344  function convert_smilies( $text ) {
3345      global $wp_smiliessearch;
3346      $output = '';
3347      if ( get_option( 'use_smilies' ) && ! empty( $wp_smiliessearch ) ) {
3348          // HTML loop taken from texturize function, could possible be consolidated.
3349          $textarr = preg_split( '/(<.*>)/U', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // Capture the tags as well as in between.
3350          $stop    = count( $textarr ); // Loop stuff.
3351  
3352          // Ignore proessing of specific tags.
3353          $tags_to_ignore       = 'code|pre|style|script|textarea';
3354          $ignore_block_element = '';
3355  
3356          for ( $i = 0; $i < $stop; $i++ ) {
3357              $content = $textarr[ $i ];
3358  
3359              // If we're in an ignore block, wait until we find its closing tag.
3360              if ( '' === $ignore_block_element && preg_match( '/^<(' . $tags_to_ignore . ')[^>]*>/', $content, $matches ) ) {
3361                  $ignore_block_element = $matches[1];
3362              }
3363  
3364              // If it's not a tag and not in ignore block.
3365              if ( '' === $ignore_block_element && strlen( $content ) > 0 && '<' !== $content[0] ) {
3366                  $content = preg_replace_callback( $wp_smiliessearch, 'translate_smiley', $content );
3367              }
3368  
3369              // Did we exit ignore block?
3370              if ( '' !== $ignore_block_element && '</' . $ignore_block_element . '>' === $content ) {
3371                  $ignore_block_element = '';
3372              }
3373  
3374              $output .= $content;
3375          }
3376      } else {
3377          // Return default text.
3378          $output = $text;
3379      }
3380      return $output;
3381  }
3382  
3383  /**
3384   * Verifies that an email is valid.
3385   *
3386   * Does not grok i18n domains. Not RFC compliant.
3387   *
3388   * @since 0.71
3389   *
3390   * @param string $email      Email address to verify.
3391   * @param bool   $deprecated Deprecated.
3392   * @return string|false Valid email address on success, false on failure.
3393   */
3394  function is_email( $email, $deprecated = false ) {
3395      if ( ! empty( $deprecated ) ) {
3396          _deprecated_argument( __FUNCTION__, '3.0.0' );
3397      }
3398  
3399      // Test for the minimum length the email can be.
3400      if ( strlen( $email ) < 6 ) {
3401          /**
3402           * Filters whether an email address is valid.
3403           *
3404           * This filter is evaluated under several different contexts, such as 'email_too_short',
3405           * 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits',
3406           * 'domain_no_periods', 'sub_hyphen_limits', 'sub_invalid_chars', or no specific context.
3407           *
3408           * @since 2.8.0
3409           *
3410           * @param string|false $is_email The email address if successfully passed the is_email() checks, false otherwise.
3411           * @param string       $email    The email address being checked.
3412           * @param string       $context  Context under which the email was tested.
3413           */
3414          return apply_filters( 'is_email', false, $email, 'email_too_short' );
3415      }
3416  
3417      // Test for an @ character after the first position.
3418      if ( strpos( $email, '@', 1 ) === false ) {
3419          /** This filter is documented in wp-includes/formatting.php */
3420          return apply_filters( 'is_email', false, $email, 'email_no_at' );
3421      }
3422  
3423      // Split out the local and domain parts.
3424      list( $local, $domain ) = explode( '@', $email, 2 );
3425  
3426      // LOCAL PART
3427      // Test for invalid characters.
3428      if ( ! preg_match( '/^[a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]+$/', $local ) ) {
3429          /** This filter is documented in wp-includes/formatting.php */
3430          return apply_filters( 'is_email', false, $email, 'local_invalid_chars' );
3431      }
3432  
3433      // DOMAIN PART
3434      // Test for sequences of periods.
3435      if ( preg_match( '/\.{2,}/', $domain ) ) {
3436          /** This filter is documented in wp-includes/formatting.php */
3437          return apply_filters( 'is_email', false, $email, 'domain_period_sequence' );
3438      }
3439  
3440      // Test for leading and trailing periods and whitespace.
3441      if ( trim( $domain, " \t\n\r\0\x0B." ) !== $domain ) {
3442          /** This filter is documented in wp-includes/formatting.php */
3443          return apply_filters( 'is_email', false, $email, 'domain_period_limits' );
3444      }
3445  
3446      // Split the domain into subs.
3447      $subs = explode( '.', $domain );
3448  
3449      // Assume the domain will have at least two subs.
3450      if ( 2 > count( $subs ) ) {
3451          /** This filter is documented in wp-includes/formatting.php */
3452          return apply_filters( 'is_email', false, $email, 'domain_no_periods' );
3453      }
3454  
3455      // Loop through each sub.
3456      foreach ( $subs as $sub ) {
3457          // Test for leading and trailing hyphens and whitespace.
3458          if ( trim( $sub, " \t\n\r\0\x0B-" ) !== $sub ) {
3459              /** This filter is documented in wp-includes/formatting.php */
3460              return apply_filters( 'is_email', false, $email, 'sub_hyphen_limits' );
3461          }
3462  
3463          // Test for invalid characters.
3464          if ( ! preg_match( '/^[a-z0-9-]+$/i', $sub ) ) {
3465              /** This filter is documented in wp-includes/formatting.php */
3466              return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' );
3467          }
3468      }
3469  
3470      // Congratulations, your email made it!
3471      /** This filter is documented in wp-includes/formatting.php */
3472      return apply_filters( 'is_email', $email, $email, null );
3473  }
3474  
3475  /**
3476   * Convert to ASCII from email subjects.
3477   *
3478   * @since 1.2.0
3479   *
3480   * @param string $string Subject line
3481   * @return string Converted string to ASCII
3482   */
3483  function wp_iso_descrambler( $string ) {
3484      /* this may only work with iso-8859-1, I'm afraid */
3485      if ( ! preg_match( '#\=\?(.+)\?Q\?(.+)\?\=#i', $string, $matches ) ) {
3486          return $string;
3487      } else {
3488          $subject = str_replace( '_', ' ', $matches[2] );
3489          return preg_replace_callback( '#\=([0-9a-f]{2})#i', '_wp_iso_convert', $subject );
3490      }
3491  }
3492  
3493  /**
3494   * Helper function to convert hex encoded chars to ASCII
3495   *
3496   * @since 3.1.0
3497   * @access private
3498   *
3499   * @param array $match The preg_replace_callback matches array
3500   * @return string Converted chars
3501   */
3502  function _wp_iso_convert( $match ) {
3503      return chr( hexdec( strtolower( $match[1] ) ) );
3504  }
3505  
3506  /**
3507   * Given a date in the timezone of the site, returns that date in UTC.
3508   *
3509   * Requires and returns a date in the Y-m-d H:i:s format.
3510   * Return format can be overridden using the $format parameter.
3511   *
3512   * @since 1.2.0
3513   *
3514   * @param string $string The date to be converted, in the timezone of the site.
3515   * @param string $format The format string for the returned date. Default 'Y-m-d H:i:s'.
3516   * @return string Formatted version of the date, in UTC.
3517   */
3518  function get_gmt_from_date( $string, $format = 'Y-m-d H:i:s' ) {
3519      $datetime = date_create( $string, wp_timezone() );
3520  
3521      if ( false === $datetime ) {
3522          return gmdate( $format, 0 );
3523      }
3524  
3525      return $datetime->setTimezone( new DateTimeZone( 'UTC' ) )->format( $format );
3526  }
3527  
3528  /**
3529   * Given a date in UTC or GMT timezone, returns that date in the timezone of the site.
3530   *
3531   * Requires and returns a date in the Y-m-d H:i:s format.
3532   * Return format can be overridden using the $format parameter.
3533   *
3534   * @since 1.2.0
3535   *
3536   * @param string $string The date to be converted, in UTC or GMT timezone.
3537   * @param string $format The format string for the returned date. Default 'Y-m-d H:i:s'.
3538   * @return string Formatted version of the date, in the site's timezone.
3539   */
3540  function get_date_from_gmt( $string, $format = 'Y-m-d H:i:s' ) {
3541      $datetime = date_create( $string, new DateTimeZone( 'UTC' ) );
3542  
3543      if ( false === $datetime ) {
3544          return gmdate( $format, 0 );
3545      }
3546  
3547      return $datetime->setTimezone( wp_timezone() )->format( $format );
3548  }
3549  
3550  /**
3551   * Given an ISO 8601 timezone, returns its UTC offset in seconds.
3552   *
3553   * @since 1.5.0
3554   *
3555   * @param string $timezone Either 'Z' for 0 offset or '±hhmm'.
3556   * @return int|float The offset in seconds.
3557   */
3558  function iso8601_timezone_to_offset( $timezone ) {
3559      // $timezone is either 'Z' or '[+|-]hhmm'.
3560      if ( 'Z' === $timezone ) {
3561          $offset = 0;
3562      } else {
3563          $sign    = ( '+' === substr( $timezone, 0, 1 ) ) ? 1 : -1;
3564          $hours   = intval( substr( $timezone, 1, 2 ) );
3565          $minutes = intval( substr( $timezone, 3, 4 ) ) / 60;
3566          $offset  = $sign * HOUR_IN_SECONDS * ( $hours + $minutes );
3567      }
3568      return $offset;
3569  }
3570  
3571  /**
3572   * Given an ISO 8601 (Ymd\TH:i:sO) date, returns a MySQL DateTime (Y-m-d H:i:s) format used by post_date[_gmt].
3573   *
3574   * @since 1.5.0
3575   *
3576   * @param string $date_string Date and time in ISO 8601 format {@link https://en.wikipedia.org/wiki/ISO_8601}.
3577   * @param string $timezone    Optional. If set to 'gmt' returns the result in UTC. Default 'user'.
3578   * @return string|bool The date and time in MySQL DateTime format - Y-m-d H:i:s, or false on failure.
3579   */
3580  function iso8601_to_datetime( $date_string, $timezone = 'user' ) {
3581      $timezone    = strtolower( $timezone );
3582      $wp_timezone = wp_timezone();
3583      $datetime    = date_create( $date_string, $wp_timezone ); // Timezone is ignored if input has one.
3584  
3585      if ( false === $datetime ) {
3586          return false;
3587      }
3588  
3589      if ( 'gmt' === $timezone ) {
3590          return $datetime->setTimezone( new DateTimeZone( 'UTC' ) )->format( 'Y-m-d H:i:s' );
3591      }
3592  
3593      if ( 'user' === $timezone ) {
3594          return $datetime->setTimezone( $wp_timezone )->format( 'Y-m-d H:i:s' );
3595      }
3596  
3597      return false;
3598  }
3599  
3600  /**
3601   * Strips out all characters that are not allowable in an email.
3602   *
3603   * @since 1.5.0
3604   *
3605   * @param string $email Email address to filter.
3606   * @return string Filtered email address.
3607   */
3608  function sanitize_email( $email ) {
3609      // Test for the minimum length the email can be.
3610      if ( strlen( $email ) < 6 ) {
3611          /**
3612           * Filters a sanitized email address.
3613           *
3614           * This filter is evaluated under several contexts, including 'email_too_short',
3615           * 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits',
3616           * 'domain_no_periods', 'domain_no_valid_subs', or no context.
3617           *
3618           * @since 2.8.0
3619           *
3620           * @param string $sanitized_email The sanitized email address.
3621           * @param string $email           The email address, as provided to sanitize_email().
3622           * @param string|null $message    A message to pass to the user. null if email is sanitized.
3623           */
3624          return apply_filters( 'sanitize_email', '', $email, 'email_too_short' );
3625      }
3626  
3627      // Test for an @ character after the first position.
3628      if ( strpos( $email, '@', 1 ) === false ) {
3629          /** This filter is documented in wp-includes/formatting.php */
3630          return apply_filters( 'sanitize_email', '', $email, 'email_no_at' );
3631      }
3632  
3633      // Split out the local and domain parts.
3634      list( $local, $domain ) = explode( '@', $email, 2 );
3635  
3636      // LOCAL PART
3637      // Test for invalid characters.
3638      $local = preg_replace( '/[^a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]/', '', $local );
3639      if ( '' === $local ) {
3640          /** This filter is documented in wp-includes/formatting.php */
3641          return apply_filters( 'sanitize_email', '', $email, 'local_invalid_chars' );
3642      }
3643  
3644      // DOMAIN PART
3645      // Test for sequences of periods.
3646      $domain = preg_replace( '/\.{2,}/', '', $domain );
3647      if ( '' === $domain ) {
3648          /** This filter is documented in wp-includes/formatting.php */
3649          return apply_filters( 'sanitize_email', '', $email, 'domain_period_sequence' );
3650      }
3651  
3652      // Test for leading and trailing periods and whitespace.
3653      $domain = trim( $domain, " \t\n\r\0\x0B." );
3654      if ( '' === $domain ) {
3655          /** This filter is documented in wp-includes/formatting.php */
3656          return apply_filters( 'sanitize_email', '', $email, 'domain_period_limits' );
3657      }
3658  
3659      // Split the domain into subs.
3660      $subs = explode( '.', $domain );
3661  
3662      // Assume the domain will have at least two subs.
3663      if ( 2 > count( $subs ) ) {
3664          /** This filter is documented in wp-includes/formatting.php */
3665          return apply_filters( 'sanitize_email', '', $email, 'domain_no_periods' );
3666      }
3667  
3668      // Create an array that will contain valid subs.
3669      $new_subs = array();
3670  
3671      // Loop through each sub.
3672      foreach ( $subs as $sub ) {
3673          // Test for leading and trailing hyphens.
3674          $sub = trim( $sub, " \t\n\r\0\x0B-" );
3675  
3676          // Test for invalid characters.
3677          $sub = preg_replace( '/[^a-z0-9-]+/i', '', $sub );
3678  
3679          // If there's anything left, add it to the valid subs.
3680          if ( '' !== $sub ) {
3681              $new_subs[] = $sub;
3682          }
3683      }
3684  
3685      // If there aren't 2 or more valid subs.
3686      if ( 2 > count( $new_subs ) ) {
3687          /** This filter is documented in wp-includes/formatting.php */
3688          return apply_filters( 'sanitize_email', '', $email, 'domain_no_valid_subs' );
3689      }
3690  
3691      // Join valid subs into the new domain.
3692      $domain = join( '.', $new_subs );
3693  
3694      // Put the email back together.
3695      $sanitized_email = $local . '@' . $domain;
3696  
3697      // Congratulations, your email made it!
3698      /** This filter is documented in wp-includes/formatting.php */
3699      return apply_filters( 'sanitize_email', $sanitized_email, $email, null );
3700  }
3701  
3702  /**
3703   * Determines the difference between two timestamps.
3704   *
3705   * The difference is returned in a human readable format such as "1 hour",
3706   * "5 mins", "2 days".
3707   *
3708   * @since 1.5.0
3709   * @since 5.3.0 Added support for showing a difference in seconds.
3710   *
3711   * @param int $from Unix timestamp from which the difference begins.
3712   * @param int $to   Optional. Unix timestamp to end the time difference. Default becomes time() if not set.
3713   * @return string Human readable time difference.
3714   */
3715  function human_time_diff( $from, $to = 0 ) {
3716      if ( empty( $to ) ) {
3717          $to = time();
3718      }
3719  
3720      $diff = (int) abs( $to - $from );
3721  
3722      if ( $diff < MINUTE_IN_SECONDS ) {
3723          $secs = $diff;
3724          if ( $secs <= 1 ) {
3725              $secs = 1;
3726          }
3727          /* translators: Time difference between two dates, in seconds. %s: Number of seconds. */
3728          $since = sprintf( _n( '%s second', '%s seconds', $secs ), $secs );
3729      } elseif ( $diff < HOUR_IN_SECONDS && $diff >= MINUTE_IN_SECONDS ) {
3730          $mins = round( $diff / MINUTE_IN_SECONDS );
3731          if ( $mins <= 1 ) {
3732              $mins = 1;
3733          }
3734          /* translators: Time difference between two dates, in minutes (min=minute). %s: Number of minutes. */
3735          $since = sprintf( _n( '%s min', '%s mins', $mins ), $mins );
3736      } elseif ( $diff < DAY_IN_SECONDS && $diff >= HOUR_IN_SECONDS ) {
3737          $hours = round( $diff / HOUR_IN_SECONDS );
3738          if ( $hours <= 1 ) {
3739              $hours = 1;
3740          }
3741          /* translators: Time difference between two dates, in hours. %s: Number of hours. */
3742          $since = sprintf( _n( '%s hour', '%s hours', $hours ), $hours );
3743      } elseif ( $diff < WEEK_IN_SECONDS && $diff >= DAY_IN_SECONDS ) {
3744          $days = round( $diff / DAY_IN_SECONDS );
3745          if ( $days <= 1 ) {
3746              $days = 1;
3747          }
3748          /* translators: Time difference between two dates, in days. %s: Number of days. */
3749          $since = sprintf( _n( '%s day', '%s days', $days ), $days );
3750      } elseif ( $diff < MONTH_IN_SECONDS && $diff >= WEEK_IN_SECONDS ) {
3751          $weeks = round( $diff / WEEK_IN_SECONDS );
3752          if ( $weeks <= 1 ) {
3753              $weeks = 1;
3754          }
3755          /* translators: Time difference between two dates, in weeks. %s: Number of weeks. */
3756          $since = sprintf( _n( '%s week', '%s weeks', $weeks ), $weeks );
3757      } elseif ( $diff < YEAR_IN_SECONDS && $diff >= MONTH_IN_SECONDS ) {
3758          $months = round( $diff / MONTH_IN_SECONDS );
3759          if ( $months <= 1 ) {
3760              $months = 1;
3761          }
3762          /* translators: Time difference between two dates, in months. %s: Number of months. */
3763          $since = sprintf( _n( '%s month', '%s months', $months ), $months );
3764      } elseif ( $diff >= YEAR_IN_SECONDS ) {
3765          $years = round( $diff / YEAR_IN_SECONDS );
3766          if ( $years <= 1 ) {
3767              $years = 1;
3768          }
3769          /* translators: Time difference between two dates, in years. %s: Number of years. */
3770          $since = sprintf( _n( '%s year', '%s years', $years ), $years );
3771      }
3772  
3773      /**
3774       * Filters the human readable difference between two timestamps.
3775       *
3776       * @since 4.0.0
3777       *
3778       * @param string $since The difference in human readable text.
3779       * @param int    $diff  The difference in seconds.
3780       * @param int    $from  Unix timestamp from which the difference begins.
3781       * @param int    $to    Unix timestamp to end the time difference.
3782       */
3783      return apply_filters( 'human_time_diff', $since, $diff, $from, $to );
3784  }
3785  
3786  /**
3787   * Generates an excerpt from the content, if needed.
3788   *
3789   * Returns a maximum of 55 words with an ellipsis appended if necessary.
3790   *
3791   * The 55 word limit can be modified by plugins/themes using the {@see 'excerpt_length'} filter
3792   * The ' [&hellip;]' string can be modified by plugins/themes using the {@see 'excerpt_more'} filter
3793   *
3794   * @since 1.5.0
3795   * @since 5.2.0 Added the `$post` parameter.
3796   *
3797   * @param string             $text Optional. The excerpt. If set to empty, an excerpt is generated.
3798   * @param WP_Post|object|int $post Optional. WP_Post instance or Post ID/object. Default null.
3799   * @return string The excerpt.
3800   */
3801  function wp_trim_excerpt( $text = '', $post = null ) {
3802      $raw_excerpt = $text;
3803  
3804      if ( '' === $text ) {
3805          $post = get_post( $post );
3806          $text = get_the_content( '', false, $post );
3807  
3808          $text = strip_shortcodes( $text );
3809          $text = excerpt_remove_blocks( $text );
3810  
3811          /** This filter is documented in wp-includes/post-template.php */
3812          $text = apply_filters( 'the_content', $text );
3813          $text = str_replace( ']]>', ']]&gt;', $text );
3814  
3815          /* translators: Maximum number of words used in a post excerpt. */
3816          $excerpt_length = intval( _x( '55', 'excerpt_length' ) );
3817  
3818          /**
3819           * Filters the maximum number of words in a post excerpt.
3820           *
3821           * @since 2.7.0
3822           *
3823           * @param int $number The maximum number of words. Default 55.
3824           */
3825          $excerpt_length = (int) apply_filters( 'excerpt_length', $excerpt_length );
3826  
3827          /**
3828           * Filters the string in the "more" link displayed after a trimmed excerpt.
3829           *
3830           * @since 2.9.0
3831           *
3832           * @param string $more_string The string shown within the more link.
3833           */
3834          $excerpt_more = apply_filters( 'excerpt_more', ' ' . '[&hellip;]' );
3835          $text         = wp_trim_words( $text, $excerpt_length, $excerpt_more );
3836      }
3837  
3838      /**
3839       * Filters the trimmed excerpt string.
3840       *
3841       * @since 2.8.0
3842       *
3843       * @param string $text        The trimmed text.
3844       * @param string $raw_excerpt The text prior to trimming.
3845       */
3846      return apply_filters( 'wp_trim_excerpt', $text, $raw_excerpt );
3847  }
3848  
3849  /**
3850   * Trims text to a certain number of words.
3851   *
3852   * This function is localized. For languages that count 'words' by the individual
3853   * character (such as East Asian languages), the $num_words argument will apply
3854   * to the number of individual characters.
3855   *
3856   * @since 3.3.0
3857   *
3858   * @param string $text      Text to trim.
3859   * @param int    $num_words Number of words. Default 55.
3860   * @param string $more      Optional. What to append if $text needs to be trimmed. Default '&hellip;'.
3861   * @return string Trimmed text.
3862   */
3863  function wp_trim_words( $text, $num_words = 55, $more = null ) {
3864      if ( null === $more ) {
3865          $more = __( '&hellip;' );
3866      }
3867  
3868      $original_text = $text;
3869      $text          = wp_strip_all_tags( $text );
3870      $num_words     = (int) $num_words;
3871  
3872      /*
3873       * translators: If your word count is based on single characters (e.g. East Asian characters),
3874       * enter 'characters_excluding_spaces' or 'characters_including_spaces'. Otherwise, enter 'words'.
3875       * Do not translate into your own language.
3876       */
3877      if ( strpos( _x( 'words', 'Word count type. Do not translate!' ), 'characters' ) === 0 && preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) {
3878          $text = trim( preg_replace( "/[\n\r\t ]+/", ' ', $text ), ' ' );
3879          preg_match_all( '/./u', $text, $words_array );
3880          $words_array = array_slice( $words_array[0], 0, $num_words + 1 );
3881          $sep         = '';
3882      } else {
3883          $words_array = preg_split( "/[\n\r\t ]+/", $text, $num_words + 1, PREG_SPLIT_NO_EMPTY );
3884          $sep         = ' ';
3885      }
3886  
3887      if ( count( $words_array ) > $num_words ) {
3888          array_pop( $words_array );
3889          $text = implode( $sep, $words_array );
3890          $text = $text . $more;
3891      } else {
3892          $text = implode( $sep, $words_array );
3893      }
3894  
3895      /**
3896       * Filters the text content after words have been trimmed.
3897       *
3898       * @since 3.3.0
3899       *
3900       * @param string $text          The trimmed text.
3901       * @param int    $num_words     The number of words to trim the text to. Default 55.
3902       * @param string $more          An optional string to append to the end of the trimmed text, e.g. &hellip;.
3903       * @param string $original_text The text before it was trimmed.
3904       */
3905      return apply_filters( 'wp_trim_words', $text, $num_words, $more, $original_text );
3906  }
3907  
3908  /**
3909   * Converts named entities into numbered entities.
3910   *
3911   * @since 1.5.1
3912   *
3913   * @param string $text The text within which entities will be converted.
3914   * @return string Text with converted entities.
3915   */
3916  function ent2ncr( $text ) {
3917  
3918      /**
3919       * Filters text before named entities are converted into numbered entities.
3920       *
3921       * A non-null string must be returned for the filter to be evaluated.
3922       *
3923       * @since 3.3.0
3924       *
3925       * @param string|null $converted_text The text to be converted. Default null.
3926       * @param string      $text           The text prior to entity conversion.
3927       */
3928      $filtered = apply_filters( 'pre_ent2ncr', null, $text );
3929      if ( null !== $filtered ) {
3930          return $filtered;
3931      }
3932  
3933      $to_ncr = array(
3934          '&quot;'     => '&#34;',
3935          '&amp;'      => '&#38;',
3936          '&lt;'       => '&#60;',
3937          '&gt;'       => '&#62;',
3938          '|'          => '&#124;',
3939          '&nbsp;'     => '&#160;',
3940          '&iexcl;'    => '&#161;',
3941          '&cent;'     => '&#162;',
3942          '&pound;'    => '&#163;',
3943          '&curren;'   => '&#164;',
3944          '&yen;'      => '&#165;',
3945          '&brvbar;'   => '&#166;',
3946          '&brkbar;'   => '&#166;',
3947          '&sect;'     => '&#167;',
3948          '&uml;'      => '&#168;',
3949          '&die;'      => '&#168;',
3950          '&copy;'     => '&#169;',
3951          '&ordf;'     => '&#170;',
3952          '&laquo;'    => '&#171;',
3953          '&not;'      => '&#172;',
3954          '&shy;'      => '&#173;',
3955          '&reg;'      => '&#174;',
3956          '&macr;'     => '&#175;',
3957          '&hibar;'    => '&#175;',
3958          '&deg;'      => '&#176;',
3959          '&plusmn;'   => '&#177;',
3960          '&sup2;'     => '&#178;',
3961          '&sup3;'     => '&#179;',
3962          '&acute;'    => '&#180;',
3963          '&micro;'    => '&#181;',
3964          '&para;'     => '&#182;',
3965          '&middot;'   => '&#183;',
3966          '&cedil;'    => '&#184;',
3967          '&sup1;'     => '&#185;',
3968          '&ordm;'     => '&#186;',
3969          '&raquo;'    => '&#187;',
3970          '&frac14;'   => '&#188;',
3971          '&frac12;'   => '&#189;',
3972          '&frac34;'   => '&#190;',
3973          '&iquest;'   => '&#191;',
3974          '&Agrave;'   => '&#192;',
3975          '&Aacute;'   => '&#193;',
3976          '&Acirc;'    => '&#194;',
3977          '&Atilde;'   => '&#195;',
3978          '&Auml;'     => '&#196;',
3979          '&Aring;'    => '&#197;',
3980          '&AElig;'    => '&#198;',
3981          '&Ccedil;'   => '&#199;',
3982          '&Egrave;'   => '&#200;',
3983          '&Eacute;'   => '&#201;',
3984          '&Ecirc;'    => '&#202;',
3985          '&Euml;'     => '&#203;',
3986          '&Igrave;'   => '&#204;',
3987          '&Iacute;'   => '&#205;',
3988          '&Icirc;'    => '&#206;',
3989          '&Iuml;'     => '&#207;',
3990          '&ETH;'      => '&#208;',
3991          '&Ntilde;'   => '&#209;',
3992          '&Ograve;'   => '&#210;',
3993          '&Oacute;'   => '&#211;',
3994          '&Ocirc;'    => '&#212;',
3995          '&Otilde;'   => '&#213;',
3996          '&Ouml;'     => '&#214;',
3997          '&times;'    => '&#215;',
3998          '&Oslash;'   => '&#216;',
3999          '&Ugrave;'   => '&#217;',
4000          '&Uacute;'   => '&#218;',
4001          '&Ucirc;'    => '&#219;',
4002          '&Uuml;'     => '&#220;',
4003          '&Yacute;'   => '&#221;',
4004          '&THORN;'    => '&#222;',
4005          '&szlig;'    => '&#223;',
4006          '&agrave;'   => '&#224;',
4007          '&aacute;'   => '&#225;',
4008          '&acirc;'    => '&#226;',
4009          '&atilde;'   => '&#227;',
4010          '&auml;'     => '&#228;',
4011          '&aring;'    => '&#229;',
4012          '&aelig;'    => '&#230;',
4013          '&ccedil;'   => '&#231;',
4014          '&egrave;'   => '&#232;',
4015          '&eacute;'   => '&#233;',
4016          '&ecirc;'    => '&#234;',
4017          '&euml;'     => '&#235;',
4018          '&igrave;'   => '&#236;',
4019          '&iacute;'   => '&#237;',
4020          '&icirc;'    => '&#238;',
4021          '&iuml;'     => '&#239;',
4022          '&eth;'      => '&#240;',
4023          '&ntilde;'   => '&#241;',
4024          '&ograve;'   => '&#242;',
4025          '&oacute;'   => '&#243;',
4026          '&ocirc;'    => '&#244;',
4027          '&otilde;'   => '&#245;',
4028          '&ouml;'     => '&#246;',
4029          '&divide;'   => '&#247;',
4030          '&oslash;'   => '&#248;',
4031          '&ugrave;'   => '&#249;',
4032          '&uacute;'   => '&#250;',
4033          '&ucirc;'    => '&#251;',
4034          '&uuml;'     => '&#252;',
4035          '&yacute;'   => '&#253;',
4036          '&thorn;'    => '&#254;',
4037          '&yuml;'     => '&#255;',
4038          '&OElig;'    => '&#338;',
4039          '&oelig;'    => '&#339;',
4040          '&Scaron;'   => '&#352;',
4041          '&scaron;'   => '&#353;',
4042          '&Yuml;'     => '&#376;',
4043          '&fnof;'     => '&#402;',
4044          '&circ;'     => '&#710;',
4045          '&tilde;'    => '&#732;',
4046          '&Alpha;'    => '&#913;',
4047          '&Beta;'     => '&#914;',
4048          '&Gamma;'    => '&#915;',
4049          '&Delta;'    => '&#916;',
4050          '&Epsilon;'  => '&#917;',
4051          '&Zeta;'     => '&#918;',
4052          '&Eta;'      => '&#919;',
4053          '&Theta;'    => '&#920;',
4054          '&Iota;'     => '&#921;',
4055          '&Kappa;'    => '&#922;',
4056          '&Lambda;'   => '&#923;',
4057          '&Mu;'       => '&#924;',
4058          '&Nu;'       => '&#925;',
4059          '&Xi;'       => '&#926;',
4060          '&Omicron;'  => '&#927;',
4061          '&Pi;'       => '&#928;',
4062          '&Rho;'      => '&#929;',
4063          '&Sigma;'    => '&#931;',
4064          '&Tau;'      => '&#932;',
4065          '&Upsilon;'  => '&#933;',
4066          '&Phi;'      => '&#934;',
4067          '&Chi;'      => '&#935;',
4068          '&Psi;'      => '&#936;',
4069          '&Omega;'    => '&#937;',
4070          '&alpha;'    => '&#945;',
4071          '&beta;'     => '&#946;',
4072          '&gamma;'    => '&#947;',
4073          '&delta;'    => '&#948;',
4074          '&epsilon;'  => '&#949;',
4075          '&zeta;'     => '&#950;',
4076          '&eta;'      => '&#951;',
4077          '&theta;'    => '&#952;',
4078          '&iota;'     => '&#953;',
4079          '&kappa;'    => '&#954;',
4080          '&lambda;'   => '&#955;',
4081          '&mu;'       => '&#956;',
4082          '&nu;'       => '&#957;',
4083          '&xi;'       => '&#958;',
4084          '&omicron;'  => '&#959;',
4085          '&pi;'       => '&#960;',
4086          '&rho;'      => '&#961;',
4087          '&sigmaf;'   => '&#962;',
4088          '&sigma;'    => '&#963;',
4089          '&tau;'      => '&#964;',
4090          '&upsilon;'  => '&#965;',
4091          '&phi;'      => '&#966;',
4092          '&chi;'      => '&#967;',
4093          '&psi;'      => '&#968;',
4094          '&omega;'    => '&#969;',
4095          '&thetasym;' => '&#977;',
4096          '&upsih;'    => '&#978;',
4097          '&piv;'      => '&#982;',
4098          '&ensp;'     => '&#8194;',
4099          '&emsp;'     => '&#8195;',
4100          '&thinsp;'   => '&#8201;',
4101          '&zwnj;'     => '&#8204;',
4102          '&zwj;'      => '&#8205;',
4103          '&lrm;'      => '&#8206;',
4104          '&rlm;'      => '&#8207;',
4105          '&ndash;'    => '&#8211;',
4106          '&mdash;'    => '&#8212;',
4107          '&lsquo;'    => '&#8216;',
4108          '&rsquo;'    => '&#8217;',
4109          '&sbquo;'    => '&#8218;',
4110          '&ldquo;'    => '&#8220;',
4111          '&rdquo;'    => '&#8221;',
4112          '&bdquo;'    => '&#8222;',
4113          '&dagger;'   => '&#8224;',
4114          '&Dagger;'   => '&#8225;',
4115          '&bull;'     => '&#8226;',
4116          '&hellip;'   => '&#8230;',
4117          '&permil;'   => '&#8240;',
4118          '&prime;'    => '&#8242;',
4119          '&Prime;'    => '&#8243;',
4120          '&lsaquo;'   => '&#8249;',
4121          '&rsaquo;'   => '&#8250;',
4122          '&oline;'    => '&#8254;',
4123          '&frasl;'    => '&#8260;',
4124          '&euro;'     => '&#8364;',
4125          '&image;'    => '&#8465;',
4126          '&weierp;'   => '&#8472;',
4127          '&real;'     => '&#8476;',
4128          '&trade;'    => '&#8482;',
4129          '&alefsym;'  => '&#8501;',
4130          '&crarr;'    => '&#8629;',
4131          '&lArr;'     => '&#8656;',
4132          '&uArr;'     => '&#8657;',
4133          '&rArr;'     => '&#8658;',
4134          '&dArr;'     => '&#8659;',
4135          '&hArr;'     => '&#8660;',
4136          '&forall;'   => '&#8704;',
4137          '&part;'     => '&#8706;',
4138          '&exist;'    => '&#8707;',
4139          '&empty;'    => '&#8709;',
4140          '&nabla;'    => '&#8711;',
4141          '&isin;'     => '&#8712;',
4142          '&notin;'    => '&#8713;',
4143          '&ni;'       => '&#8715;',
4144          '&prod;'     => '&#8719;',
4145          '&sum;'      => '&#8721;',
4146          '&minus;'    => '&#8722;',
4147          '&lowast;'   => '&#8727;',
4148          '&radic;'    => '&#8730;',
4149          '&prop;'     => '&#8733;',
4150          '&infin;'    => '&#8734;',
4151          '&ang;'      => '&#8736;',
4152          '&and;'      => '&#8743;',
4153          '&or;'       => '&#8744;',
4154          '&cap;'      => '&#8745;',
4155          '&cup;'      => '&#8746;',
4156          '&int;'      => '&#8747;',
4157          '&there4;'   => '&#8756;',
4158          '&sim;'      => '&#8764;',
4159          '&cong;'     => '&#8773;',
4160          '&asymp;'    => '&#8776;',
4161          '&ne;'       => '&#8800;',
4162          '&equiv;'    => '&#8801;',
4163          '&le;'       => '&#8804;',
4164          '&ge;'       => '&#8805;',
4165          '&sub;'      => '&#8834;',
4166          '&sup;'      => '&#8835;',
4167          '&nsub;'     => '&#8836;',
4168          '&sube;'     => '&#8838;',
4169          '&supe;'     => '&#8839;',
4170          '&oplus;'    => '&#8853;',
4171          '&otimes;'   => '&#8855;',
4172          '&perp;'     => '&#8869;',
4173          '&sdot;'     => '&#8901;',
4174          '&lceil;'    => '&#8968;',
4175          '&rceil;'    => '&#8969;',
4176          '&lfloor;'   => '&#8970;',
4177          '&rfloor;'   => '&#8971;',
4178          '&lang;'     => '&#9001;',
4179          '&rang;'     => '&#9002;',
4180          '&larr;'     => '&#8592;',
4181          '&uarr;'     => '&#8593;',
4182          '&rarr;'     => '&#8594;',
4183          '&darr;'     => '&#8595;',
4184          '&harr;'     => '&#8596;',
4185          '&loz;'      => '&#9674;',
4186          '&spades;'   => '&#9824;',
4187          '&clubs;'    => '&#9827;',
4188          '&hearts;'   => '&#9829;',
4189          '&diams;'    => '&#9830;',
4190      );
4191  
4192      return str_replace( array_keys( $to_ncr ), array_values( $to_ncr ), $text );
4193  }
4194  
4195  /**
4196   * Formats text for the editor.
4197   *
4198   * Generally the browsers treat everything inside a textarea as text, but
4199   * it is still a good idea to HTML entity encode `<`, `>` and `&` in the content.
4200   *
4201   * The filter {@see 'format_for_editor'} is applied here. If `$text` is empty the
4202   * filter will be applied to an empty string.
4203   *
4204   * @since 4.3.0
4205   *
4206   * @see _WP_Editors::editor()
4207   *
4208   * @param string $text           The text to be formatted.
4209   * @param string $default_editor The default editor for the current user.
4210   *                               It is usually either 'html' or 'tinymce'.
4211   * @return string The formatted text after filter is applied.
4212   */
4213  function format_for_editor( $text, $default_editor = null ) {
4214      if ( $text ) {
4215          $text = htmlspecialchars( $text, ENT_NOQUOTES, get_option( 'blog_charset' ) );
4216      }
4217  
4218      /**
4219       * Filters the text after it is formatted for the editor.
4220       *
4221       * @since 4.3.0
4222       *
4223       * @param string $text           The formatted text.
4224       * @param string $default_editor The default editor for the current user.
4225       *                               It is usually either 'html' or 'tinymce'.
4226       */
4227      return apply_filters( 'format_for_editor', $text, $default_editor );
4228  }
4229  
4230  /**
4231   * Perform a deep string replace operation to ensure the values in $search are no longer present
4232   *
4233   * Repeats the replacement operation until it no longer replaces anything so as to remove "nested" values
4234   * e.g. $subject = '%0%0%0DDD', $search ='%0D', $result ='' rather than the '%0%0DD' that
4235   * str_replace would return
4236   *
4237   * @since 2.8.1
4238   * @access private
4239   *
4240   * @param string|array $search  The value being searched for, otherwise known as the needle.
4241   *                              An array may be used to designate multiple needles.
4242   * @param string       $subject The string being searched and replaced on, otherwise known as the haystack.
4243   * @return string The string with the replaced values.
4244   */
4245  function _deep_replace( $search, $subject ) {
4246      $subject = (string) $subject;
4247  
4248      $count = 1;
4249      while ( $count ) {
4250          $subject = str_replace( $search, '', $subject, $count );
4251      }
4252  
4253      return $subject;
4254  }
4255  
4256  /**
4257   * Escapes data for use in a MySQL query.
4258   *
4259   * Usually you should prepare queries using wpdb::prepare().
4260   * Sometimes, spot-escaping is required or useful. One example
4261   * is preparing an array for use in an IN clause.
4262   *
4263   * NOTE: Since 4.8.3, '%' characters will be replaced with a placeholder string,
4264   * this prevents certain SQLi attacks from taking place. This change in behaviour
4265   * may cause issues for code that expects the return value of esc_sql() to be useable
4266   * for other purposes.
4267   *
4268   * @since 2.8.0
4269   *
4270   * @global wpdb $wpdb WordPress database abstraction object.
4271   *
4272   * @param string|array $data Unescaped data
4273   * @return string|array Escaped data
4274   */
4275  function esc_sql( $data ) {
4276      global $wpdb;
4277      return $wpdb->_escape( $data );
4278  }
4279  
4280  /**
4281   * Checks and cleans a URL.
4282   *
4283   * A number of characters are removed from the URL. If the URL is for displaying
4284   * (the default behaviour) ampersands are also replaced. The {@see 'clean_url'} filter
4285   * is applied to the returned cleaned URL.
4286   *
4287   * @since 2.8.0
4288   *
4289   * @param string   $url       The URL to be cleaned.
4290   * @param string[] $protocols Optional. An array of acceptable protocols.
4291   *                            Defaults to return value of wp_allowed_protocols().
4292   * @param string   $_context  Private. Use esc_url_raw() for database usage.
4293   * @return string The cleaned URL after the {@see 'clean_url'} filter is applied.
4294   */
4295  function esc_url( $url, $protocols = null, $_context = 'display' ) {
4296      $original_url = $url;
4297  
4298      if ( '' === $url ) {
4299          return $url;
4300      }
4301  
4302      $url = str_replace( ' ', '%20', ltrim( $url ) );
4303      $url = preg_replace( '|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\[\]\\x80-\\xff]|i', '', $url );
4304  
4305      if ( '' === $url ) {
4306          return $url;
4307      }
4308  
4309      if ( 0 !== stripos( $url, 'mailto:' ) ) {
4310          $strip = array( '%0d', '%0a', '%0D', '%0A' );
4311          $url   = _deep_replace( $strip, $url );
4312      }
4313  
4314      $url = str_replace( ';//', '://', $url );
4315      /*
4316       * If the URL doesn't appear to contain a scheme, we presume
4317       * it needs http:// prepended (unless it's a relative link
4318       * starting with /, # or ?, or a PHP file).
4319       */
4320      if ( strpos( $url, ':' ) === false && ! in_array( $url[0], array( '/', '#', '?' ), true ) &&
4321          ! preg_match( '/^[a-z0-9-]+?\.php/i', $url ) ) {
4322          $url = 'http://' . $url;
4323      }
4324  
4325      // Replace ampersands and single quotes only when displaying.
4326      if ( 'display' === $_context ) {
4327          $url = wp_kses_normalize_entities( $url );
4328          $url = str_replace( '&amp;', '&#038;', $url );
4329          $url = str_replace( "'", '&#039;', $url );
4330      }
4331  
4332      if ( ( false !== strpos( $url, '[' ) ) || ( false !== strpos( $url, ']' ) ) ) {
4333  
4334          $parsed = wp_parse_url( $url );
4335          $front  = '';
4336  
4337          if ( isset( $parsed['scheme'] ) ) {
4338              $front .= $parsed['scheme'] . '://';
4339          } elseif ( '/' === $url[0] ) {
4340              $front .= '//';
4341          }
4342  
4343          if ( isset( $parsed['user'] ) ) {
4344              $front .= $parsed['user'];
4345          }
4346  
4347          if ( isset( $parsed['pass'] ) ) {
4348              $front .= ':' . $parsed['pass'];
4349          }
4350  
4351          if ( isset( $parsed['user'] ) || isset( $parsed['pass'] ) ) {
4352              $front .= '@';
4353          }
4354  
4355          if ( isset( $parsed['host'] ) ) {
4356              $front .= $parsed['host'];
4357          }
4358  
4359          if ( isset( $parsed['port'] ) ) {
4360              $front .= ':' . $parsed['port'];
4361          }
4362  
4363          $end_dirty = str_replace( $front, '', $url );
4364          $end_clean = str_replace( array( '[', ']' ), array( '%5B', '%5D' ), $end_dirty );
4365          $url       = str_replace( $end_dirty, $end_clean, $url );
4366  
4367      }
4368  
4369      if ( '/' === $url[0] ) {
4370          $good_protocol_url = $url;
4371      } else {
4372          if ( ! is_array( $protocols ) ) {
4373              $protocols = wp_allowed_protocols();
4374          }
4375          $good_protocol_url = wp_kses_bad_protocol( $url, $protocols );
4376          if ( strtolower( $good_protocol_url ) != strtolower( $url ) ) {
4377              return '';
4378          }
4379      }
4380  
4381      /**
4382       * Filters a string cleaned and escaped for output as a URL.
4383       *
4384       * @since 2.3.0
4385       *
4386       * @param string $good_protocol_url The cleaned URL to be returned.
4387       * @param string $original_url      The URL prior to cleaning.
4388       * @param string $_context          If 'display', replace ampersands and single quotes only.
4389       */
4390      return apply_filters( 'clean_url', $good_protocol_url, $original_url, $_context );
4391  }
4392  
4393  /**
4394   * Performs esc_url() for database usage.
4395   *
4396   * @since 2.8.0
4397   *
4398   * @param string   $url       The URL to be cleaned.
4399   * @param string[] $protocols Optional. An array of acceptable protocols.
4400   *                            Defaults to return value of wp_allowed_protocols().
4401   * @return string The cleaned URL.
4402   */
4403  function esc_url_raw( $url, $protocols = null ) {
4404      return esc_url( $url, $protocols, 'db' );
4405  }
4406  
4407  /**
4408   * Convert entities, while preserving already-encoded entities.
4409   *
4410   * @link https://www.php.net/htmlentities Borrowed from the PHP Manual user notes.
4411   *
4412   * @since 1.2.2
4413   *
4414   * @param string $myHTML The text to be converted.
4415   * @return string Converted text.
4416   */
4417  function htmlentities2( $myHTML ) {
4418      $translation_table              = get_html_translation_table( HTML_ENTITIES, ENT_QUOTES );
4419      $translation_table[ chr( 38 ) ] = '&';
4420      return preg_replace( '/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,3};)/', '&amp;', strtr( $myHTML, $translation_table ) );
4421  }
4422  
4423  /**
4424   * Escape single quotes, htmlspecialchar " < > &, and fix line endings.
4425   *
4426   * Escapes text strings for echoing in JS. It is intended to be used for inline JS
4427   * (in a tag attribute, for example onclick="..."). Note that the strings have to
4428   * be in single quotes. The {@see 'js_escape'} filter is also applied here.
4429   *
4430   * @since 2.8.0
4431   *
4432   * @param string $text The text to be escaped.
4433   * @return string Escaped text.
4434   */
4435  function esc_js( $text ) {
4436      $safe_text = wp_check_invalid_utf8( $text );
4437      $safe_text = _wp_specialchars( $safe_text, ENT_COMPAT );
4438      $safe_text = preg_replace( '/&#(x)?0*(?(1)27|39);?/i', "'", stripslashes( $safe_text ) );
4439      $safe_text = str_replace( "\r", '', $safe_text );
4440      $safe_text = str_replace( "\n", '\\n', addslashes( $safe_text ) );
4441      /**
4442       * Filters a string cleaned and escaped for output in JavaScript.
4443       *
4444       * Text passed to esc_js() is stripped of invalid or special characters,
4445       * and properly slashed for output.
4446       *
4447       * @since 2.0.6
4448       *
4449       * @param string $safe_text The text after it has been escaped.
4450       * @param string $text      The text prior to being escaped.
4451       */
4452      return apply_filters( 'js_escape', $safe_text, $text );
4453  }
4454  
4455  /**
4456   * Escaping for HTML blocks.
4457   *
4458   * @since 2.8.0
4459   *
4460   * @param string $text
4461   * @return string
4462   */
4463  function esc_html( $text ) {
4464      $safe_text = wp_check_invalid_utf8( $text );
4465      $safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );
4466      /**
4467       * Filters a string cleaned and escaped for output in HTML.
4468       *
4469       * Text passed to esc_html() is stripped of invalid or special characters
4470       * before output.
4471       *
4472       * @since 2.8.0
4473       *
4474       * @param string $safe_text The text after it has been escaped.
4475       * @param string $text      The text prior to being escaped.
4476       */
4477      return apply_filters( 'esc_html', $safe_text, $text );
4478  }
4479  
4480  /**
4481   * Escaping for HTML attributes.
4482   *
4483   * @since 2.8.0
4484   *
4485   * @param string $text
4486   * @return string
4487   */
4488  function esc_attr( $text ) {
4489      $safe_text = wp_check_invalid_utf8( $text );
4490      $safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );
4491      /**
4492       * Filters a string cleaned and escaped for output in an HTML attribute.
4493       *
4494       * Text passed to esc_attr() is stripped of invalid or special characters
4495       * before output.
4496       *
4497       * @since 2.0.6
4498       *
4499       * @param string $safe_text The text after it has been escaped.
4500       * @param string $text      The text prior to being escaped.
4501       */
4502      return apply_filters( 'attribute_escape', $safe_text, $text );
4503  }
4504  
4505  /**
4506   * Escaping for textarea values.
4507   *
4508   * @since 3.1.0
4509   *
4510   * @param string $text
4511   * @return string
4512   */
4513  function esc_textarea( $text ) {
4514      $safe_text = htmlspecialchars( $text, ENT_QUOTES, get_option( 'blog_charset' ) );
4515      /**
4516       * Filters a string cleaned and escaped for output in a textarea element.
4517       *
4518       * @since 3.1.0
4519       *
4520       * @param string $safe_text The text after it has been escaped.
4521       * @param string $text      The text prior to being escaped.
4522       */
4523      return apply_filters( 'esc_textarea', $safe_text, $text );
4524  }
4525  
4526  /**
4527   * Escaping for XML blocks.
4528   *
4529   * @since 5.5.0
4530   *
4531   * @param string $text Text to escape.
4532   * @return string Escaped text.
4533   */
4534  function esc_xml( $text ) {
4535      $safe_text = wp_check_invalid_utf8( $text );
4536  
4537      $cdata_regex = '\<\!\[CDATA\[.*?\]\]\>';
4538      $regex       = <<<EOF
4539  /
4540      (?=.*?{$cdata_regex})                 # lookahead that will match anything followed by a CDATA Section
4541      (?<non_cdata_followed_by_cdata>(.*?)) # the "anything" matched by the lookahead
4542      (?<cdata>({$cdata_regex}))            # the CDATA Section matched by the lookahead
4543  
4544  |                                          # alternative
4545  
4546      (?<non_cdata>(.*))                    # non-CDATA Section
4547  /sx
4548  EOF;
4549  
4550      $safe_text = (string) preg_replace_callback(
4551          $regex,
4552          static function( $matches ) {
4553              if ( ! $matches[0] ) {
4554                  return '';
4555              }
4556  
4557              if ( ! empty( $matches['non_cdata'] ) ) {
4558                  // escape HTML entities in the non-CDATA Section.
4559                  return _wp_specialchars( $matches['non_cdata'], ENT_XML1 );
4560              }
4561  
4562              // Return the CDATA Section unchanged, escape HTML entities in the rest.
4563              return _wp_specialchars( $matches['non_cdata_followed_by_cdata'], ENT_XML1 ) . $matches['cdata'];
4564          },
4565          $safe_text
4566      );
4567  
4568      /**
4569       * Filters a string cleaned and escaped for output in XML.
4570       *
4571       * Text passed to esc_xml() is stripped of invalid or special characters
4572       * before output. HTML named character references are converted to their
4573       * equivalent code points.
4574       *
4575       * @since 5.5.0
4576       *
4577       * @param string $safe_text The text after it has been escaped.
4578       * @param string $text      The text prior to being escaped.
4579       */
4580      return apply_filters( 'esc_xml', $safe_text, $text );
4581  }
4582  
4583  /**
4584   * Escape an HTML tag name.
4585   *
4586   * @since 2.5.0
4587   *
4588   * @param string $tag_name
4589   * @return string
4590   */
4591  function tag_escape( $tag_name ) {
4592      $safe_tag = strtolower( preg_replace( '/[^a-zA-Z0-9_:]/', '', $tag_name ) );
4593      /**
4594       * Filters a string cleaned and escaped for output as an HTML tag.
4595       *
4596       * @since 2.8.0
4597       *
4598       * @param string $safe_tag The tag name after it has been escaped.
4599       * @param string $tag_name The text before it was escaped.
4600       */
4601      return apply_filters( 'tag_escape', $safe_tag, $tag_name );
4602  }
4603  
4604  /**
4605   * Convert full URL paths to absolute paths.
4606   *
4607   * Removes the http or https protocols and the domain. Keeps the path '/' at the
4608   * beginning, so it isn't a true relative link, but from the web root base.
4609   *
4610   * @since 2.1.0
4611   * @since 4.1.0 Support was added for relative URLs.
4612   *
4613   * @param string $link Full URL path.
4614   * @return string Absolute path.
4615   */
4616  function wp_make_link_relative( $link ) {
4617      return preg_replace( '|^(https?:)?//[^/]+(/?.*)|i', '$2', $link );
4618  }
4619  
4620  /**
4621   * Sanitises various option values based on the nature of the option.
4622   *
4623   * This is basically a switch statement which will pass $value through a number
4624   * of functions depending on the $option.
4625   *
4626   * @since 2.0.5
4627   *
4628   * @global wpdb $wpdb WordPress database abstraction object.
4629   *
4630   * @param string $option The name of the option.
4631   * @param string $value  The unsanitised value.
4632   * @return string Sanitized value.
4633   */
4634  function sanitize_option( $option, $value ) {
4635      global $wpdb;
4636  
4637      $original_value = $value;
4638      $error          = '';
4639  
4640      switch ( $option ) {
4641          case 'admin_email':
4642          case 'new_admin_email':
4643              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4644              if ( is_wp_error( $value ) ) {
4645                  $error = $value->get_error_message();
4646              } else {
4647                  $value = sanitize_email( $value );
4648                  if ( ! is_email( $value ) ) {
4649                      $error = __( 'The email address entered did not appear to be a valid email address. Please enter a valid email address.' );
4650                  }
4651              }
4652              break;
4653  
4654          case 'thumbnail_size_w':
4655          case 'thumbnail_size_h':
4656          case 'medium_size_w':
4657          case 'medium_size_h':
4658          case 'medium_large_size_w':
4659          case 'medium_large_size_h':
4660          case 'large_size_w':
4661          case 'large_size_h':
4662          case 'mailserver_port':
4663          case 'comment_max_links':
4664          case 'page_on_front':
4665          case 'page_for_posts':
4666          case 'rss_excerpt_length':
4667          case 'default_category':
4668          case 'default_email_category':
4669          case 'default_link_category':
4670          case 'close_comments_days_old':
4671          case 'comments_per_page':
4672          case 'thread_comments_depth':
4673          case 'users_can_register':
4674          case 'start_of_week':
4675          case 'site_icon':
4676              $value = absint( $value );
4677              break;
4678  
4679          case 'posts_per_page':
4680          case 'posts_per_rss':
4681              $value = (int) $value;
4682              if ( empty( $value ) ) {
4683                  $value = 1;
4684              }
4685              if ( $value < -1 ) {
4686                  $value = abs( $value );
4687              }
4688              break;
4689  
4690          case 'default_ping_status':
4691          case 'default_comment_status':
4692              // Options that if not there have 0 value but need to be something like "closed".
4693              if ( '0' == $value || '' === $value ) {
4694                  $value = 'closed';
4695              }
4696              break;
4697  
4698          case 'blogdescription':
4699          case 'blogname':
4700              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4701              if ( $value !== $original_value ) {
4702                  $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', wp_encode_emoji( $original_value ) );
4703              }
4704  
4705              if ( is_wp_error( $value ) ) {
4706                  $error = $value->get_error_message();
4707              } else {
4708                  $value = esc_html( $value );
4709              }
4710              break;
4711  
4712          case 'blog_charset':
4713              $value = preg_replace( '/[^a-zA-Z0-9_-]/', '', $value ); // Strips slashes.
4714              break;
4715  
4716          case 'blog_public':
4717              // This is the value if the settings checkbox is not checked on POST. Don't rely on this.
4718              if ( null === $value ) {
4719                  $value = 1;
4720              } else {
4721                  $value = intval( $value );
4722              }
4723              break;
4724  
4725          case 'date_format':
4726          case 'time_format':
4727          case 'mailserver_url':
4728          case 'mailserver_login':
4729          case 'mailserver_pass':
4730          case 'upload_path':
4731              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4732              if ( is_wp_error( $value ) ) {
4733                  $error = $value->get_error_message();
4734              } else {
4735                  $value = strip_tags( $value );
4736                  $value = wp_kses_data( $value );
4737              }
4738              break;
4739  
4740          case 'ping_sites':
4741              $value = explode( "\n", $value );
4742              $value = array_filter( array_map( 'trim', $value ) );
4743              $value = array_filter( array_map( 'esc_url_raw', $value ) );
4744              $value = implode( "\n", $value );
4745              break;
4746  
4747          case 'gmt_offset':
4748              $value = preg_replace( '/[^0-9:.-]/', '', $value ); // Strips slashes.
4749              break;
4750  
4751          case 'siteurl':
4752              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4753              if ( is_wp_error( $value ) ) {
4754                  $error = $value->get_error_message();
4755              } else {
4756                  if ( preg_match( '#http(s?)://(.+)#i', $value ) ) {
4757                      $value = esc_url_raw( $value );
4758                  } else {
4759                      $error = __( 'The WordPress address you entered did not appear to be a valid URL. Please enter a valid URL.' );
4760                  }
4761              }
4762              break;
4763  
4764          case 'home':
4765              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4766              if ( is_wp_error( $value ) ) {
4767                  $error = $value->get_error_message();
4768              } else {
4769                  if ( preg_match( '#http(s?)://(.+)#i', $value ) ) {
4770                      $value = esc_url_raw( $value );
4771                  } else {
4772                      $error = __( 'The Site address you entered did not appear to be a valid URL. Please enter a valid URL.' );
4773                  }
4774              }
4775              break;
4776  
4777          case 'WPLANG':
4778              $allowed = get_available_languages();
4779              if ( ! is_multisite() && defined( 'WPLANG' ) && '' !== WPLANG && 'en_US' !== WPLANG ) {
4780                  $allowed[] = WPLANG;
4781              }
4782              if ( ! in_array( $value, $allowed, true ) && ! empty( $value ) ) {
4783                  $value = get_option( $option );
4784              }
4785              break;
4786  
4787          case 'illegal_names':
4788              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4789              if ( is_wp_error( $value ) ) {
4790                  $error = $value->get_error_message();
4791              } else {
4792                  if ( ! is_array( $value ) ) {
4793                      $value = explode( ' ', $value );
4794                  }
4795  
4796                  $value = array_values( array_filter( array_map( 'trim', $value ) ) );
4797  
4798                  if ( ! $value ) {
4799                      $value = '';
4800                  }
4801              }
4802              break;
4803  
4804          case 'limited_email_domains':
4805          case 'banned_email_domains':
4806              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4807              if ( is_wp_error( $value ) ) {
4808                  $error = $value->get_error_message();
4809              } else {
4810                  if ( ! is_array( $value ) ) {
4811                      $value = explode( "\n", $value );
4812                  }
4813  
4814                  $domains = array_values( array_filter( array_map( 'trim', $value ) ) );
4815                  $value   = array();
4816  
4817                  foreach ( $domains as $domain ) {
4818                      if ( ! preg_match( '/(--|\.\.)/', $domain ) && preg_match( '|^([a-zA-Z0-9-\.])+$|', $domain ) ) {
4819                          $value[] = $domain;
4820                      }
4821                  }
4822                  if ( ! $value ) {
4823                      $value = '';
4824                  }
4825              }
4826              break;
4827  
4828          case 'timezone_string':
4829              $allowed_zones = timezone_identifiers_list();
4830              if ( ! in_array( $value, $allowed_zones, true ) && ! empty( $value ) ) {
4831                  $error = __( 'The timezone you have entered is not valid. Please select a valid timezone.' );
4832              }
4833              break;
4834  
4835          case 'permalink_structure':
4836          case 'category_base':
4837          case 'tag_base':
4838              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4839              if ( is_wp_error( $value ) ) {
4840                  $error = $value->get_error_message();
4841              } else {
4842                  $value = esc_url_raw( $value );
4843                  $value = str_replace( 'http://', '', $value );
4844              }
4845  
4846              if ( 'permalink_structure' === $option && '' !== $value && ! preg_match( '/%[^\/%]+%/', $value ) ) {
4847                  $error = sprintf(
4848                      /* translators: %s: Documentation URL. */
4849                      __( 'A structure tag is required when using custom permalinks. <a href="%s">Learn more</a>' ),
4850                      __( 'https://wordpress.org/support/article/using-permalinks/#choosing-your-permalink-structure' )
4851                  );
4852              }
4853              break;
4854  
4855          case 'default_role':
4856              if ( ! get_role( $value ) && get_role( 'subscriber' ) ) {
4857                  $value = 'subscriber';
4858              }
4859              break;
4860  
4861          case 'moderation_keys':
4862          case 'blocklist_keys':
4863              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4864              if ( is_wp_error( $value ) ) {
4865                  $error = $value->get_error_message();
4866              } else {
4867                  $value = explode( "\n", $value );
4868                  $value = array_filter( array_map( 'trim', $value ) );
4869                  $value = array_unique( $value );
4870                  $value = implode( "\n", $value );
4871              }
4872              break;
4873      }
4874  
4875      if ( ! empty( $error ) ) {
4876          $value = get_option( $option );
4877          if ( function_exists( 'add_settings_error' ) ) {
4878              add_settings_error( $option, "invalid_{$option}", $error );
4879          }
4880      }
4881  
4882      /**
4883       * Filters an option value following sanitization.
4884       *
4885       * @since 2.3.0
4886       * @since 4.3.0 Added the `$original_value` parameter.
4887       *
4888       * @param string $value          The sanitized option value.
4889       * @param string $option         The option name.
4890       * @param string $original_value The original value passed to the function.
4891       */
4892      return apply_filters( "sanitize_option_{$option}", $value, $option, $original_value );
4893  }
4894  
4895  /**
4896   * Maps a function to all non-iterable elements of an array or an object.
4897   *
4898   * This is similar to `array_walk_recursive()` but acts upon objects too.
4899   *
4900   * @since 4.4.0
4901   *
4902   * @param mixed    $value    The array, object, or scalar.
4903   * @param callable $callback The function to map onto $value.
4904   * @return mixed The value with the callback applied to all non-arrays and non-objects inside it.
4905   */
4906  function map_deep( $value, $callback ) {
4907      if ( is_array( $value ) ) {
4908          foreach ( $value as $index => $item ) {
4909              $value[ $index ] = map_deep( $item, $callback );
4910          }
4911      } elseif ( is_object( $value ) ) {
4912          $object_vars = get_object_vars( $value );
4913          foreach ( $object_vars as $property_name => $property_value ) {
4914              $value->$property_name = map_deep( $property_value, $callback );
4915          }
4916      } else {
4917          $value = call_user_func( $callback, $value );
4918      }
4919  
4920      return $value;
4921  }
4922  
4923  /**
4924   * Parses a string into variables to be stored in an array.
4925   *
4926   *
4927   * @since 2.2.1
4928   *
4929   * @param string $string The string to be parsed.
4930   * @param array  $array  Variables will be stored in this array.
4931   */
4932  function wp_parse_str( $string, &$array ) {
4933      parse_str( $string, $array );
4934  
4935      /**
4936       * Filters the array of variables derived from a parsed string.
4937       *
4938       * @since 2.3.0
4939       *
4940       * @param array $array The array populated with variables.
4941       */
4942      $array = apply_filters( 'wp_parse_str', $array );
4943  }
4944  
4945  /**
4946   * Convert lone less than signs.
4947   *
4948   * KSES already converts lone greater than signs.
4949   *
4950   * @since 2.3.0
4951   *
4952   * @param string $text Text to be converted.
4953   * @return string Converted text.
4954   */
4955  function wp_pre_kses_less_than( $text ) {
4956      return preg_replace_callback( '%<[^>]*?((?=<)|>|$)%', 'wp_pre_kses_less_than_callback', $text );
4957  }
4958  
4959  /**
4960   * Callback function used by preg_replace.
4961   *
4962   * @since 2.3.0
4963   *
4964   * @param array $matches Populated by matches to preg_replace.
4965   * @return string The text returned after esc_html if needed.
4966   */
4967  function wp_pre_kses_less_than_callback( $matches ) {
4968      if ( false === strpos( $matches[0], '>' ) ) {
4969          return esc_html( $matches[0] );
4970      }
4971      return $matches[0];
4972  }
4973  
4974  /**
4975   * Remove non-allowable HTML from parsed block attribute values when filtering
4976   * in the post context.
4977   *
4978   * @since 5.3.1
4979   *
4980   * @param string         $string            Content to be run through KSES.
4981   * @param array[]|string $allowed_html      An array of allowed HTML elements
4982   *                                          and attributes, or a context name
4983   *                                          such as 'post'.
4984   * @param string[]       $allowed_protocols Array of allowed URL protocols.
4985   * @return string Filtered text to run through KSES.
4986   */
4987  function wp_pre_kses_block_attributes( $string, $allowed_html, $allowed_protocols ) {
4988      /*
4989       * `filter_block_content` is expected to call `wp_kses`. Temporarily remove
4990       * the filter to avoid recursion.
4991       */
4992      remove_filter( 'pre_kses', 'wp_pre_kses_block_attributes', 10 );
4993      $string = filter_block_content( $string, $allowed_html, $allowed_protocols );
4994      add_filter( 'pre_kses', 'wp_pre_kses_block_attributes', 10, 3 );
4995  
4996      return $string;
4997  }
4998  
4999  /**
5000   * WordPress implementation of PHP sprintf() with filters.
5001   *
5002   * @since 2.5.0
5003   * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
5004   *              by adding it to the function signature.
5005   *
5006   * @link https://www.php.net/sprintf
5007   *
5008   * @param string $pattern The string which formatted args are inserted.
5009   * @param mixed  ...$args Arguments to be formatted into the $pattern string.
5010   * @return string The formatted string.
5011   */
5012  function wp_sprintf( $pattern, ...$args ) {
5013      $len       = strlen( $pattern );
5014      $start     = 0;
5015      $result    = '';
5016      $arg_index = 0;
5017      while ( $len > $start ) {
5018          // Last character: append and break.
5019          if ( strlen( $pattern ) - 1 == $start ) {
5020              $result .= substr( $pattern, -1 );
5021              break;
5022          }
5023  
5024          // Literal %: append and continue.
5025          if ( '%%' === substr( $pattern, $start, 2 ) ) {
5026              $start  += 2;
5027              $result .= '%';
5028              continue;
5029          }
5030  
5031          // Get fragment before next %.
5032          $end = strpos( $pattern, '%', $start + 1 );
5033          if ( false === $end ) {
5034              $end = $len;
5035          }
5036          $fragment = substr( $pattern, $start, $end - $start );
5037  
5038          // Fragment has a specifier.
5039          if ( '%' === $pattern[ $start ] ) {
5040              // Find numbered arguments or take the next one in order.
5041              if ( preg_match( '/^%(\d+)\$/', $fragment, $matches ) ) {
5042                  $index    = $matches[1] - 1; // 0-based array vs 1-based sprintf() arguments.
5043                  $arg      = isset( $args[ $index ] ) ? $args[ $index ] : '';
5044                  $fragment = str_replace( "%{$matches[1]}$", '%', $fragment );
5045              } else {
5046                  $arg = isset( $args[ $arg_index ] ) ? $args[ $arg_index ] : '';
5047                  ++$arg_index;
5048              }
5049  
5050              /**
5051               * Filters a fragment from the pattern passed to wp_sprintf().
5052               *
5053               * If the fragment is unchanged, then sprintf() will be run on the fragment.
5054               *
5055               * @since 2.5.0
5056               *
5057               * @param string $fragment A fragment from the pattern.
5058               * @param string $arg      The argument.
5059               */
5060              $_fragment = apply_filters( 'wp_sprintf', $fragment, $arg );
5061              if ( $_fragment != $fragment ) {
5062                  $fragment = $_fragment;
5063              } else {
5064                  $fragment = sprintf( $fragment, strval( $arg ) );
5065              }
5066          }
5067  
5068          // Append to result and move to next fragment.
5069          $result .= $fragment;
5070          $start   = $end;
5071      }
5072  
5073      return $result;
5074  }
5075  
5076  /**
5077   * Localize list items before the rest of the content.
5078   *
5079   * The '%l' must be at the first characters can then contain the rest of the
5080   * content. The list items will have ', ', ', and', and ' and ' added depending
5081   * on the amount of list items in the $args parameter.
5082   *
5083   * @since 2.5.0
5084   *
5085   * @param string $pattern Content containing '%l' at the beginning.
5086   * @param array  $args    List items to prepend to the content and replace '%l'.
5087   * @return string Localized list items and rest of the content.
5088   */
5089  function wp_sprintf_l( $pattern, $args ) {
5090      // Not a match.
5091      if ( '%l' !== substr( $pattern, 0, 2 ) ) {
5092          return $pattern;
5093      }
5094  
5095      // Nothing to work with.
5096      if ( empty( $args ) ) {
5097          return '';
5098      }
5099  
5100      /**
5101       * Filters the translated delimiters used by wp_sprintf_l().
5102       * Placeholders (%s) are included to assist translators and then
5103       * removed before the array of strings reaches the filter.
5104       *
5105       * Please note: Ampersands and entities should be avoided here.
5106       *
5107       * @since 2.5.0
5108       *
5109       * @param array $delimiters An array of translated delimiters.
5110       */
5111      $l = apply_filters(
5112          'wp_sprintf_l',
5113          array(
5114              /* translators: Used to join items in a list with more than 2 items. */
5115              'between'          => sprintf( __( '%1$s, %2$s' ), '', '' ),
5116              /* translators: Used to join last two items in a list with more than 2 times. */
5117              'between_last_two' => sprintf( __( '%1$s, and %2$s' ), '', '' ),
5118              /* translators: Used to join items in a list with only 2 items. */
5119              'between_only_two' => sprintf( __( '%1$s and %2$s' ), '', '' ),
5120          )
5121      );
5122  
5123      $args   = (array) $args;
5124      $result = array_shift( $args );
5125      if ( count( $args ) == 1 ) {
5126          $result .= $l['between_only_two'] . array_shift( $args );
5127      }
5128  
5129      // Loop when more than two args.
5130      $i = count( $args );
5131      while ( $i ) {
5132          $arg = array_shift( $args );
5133          $i--;
5134          if ( 0 == $i ) {
5135              $result .= $l['between_last_two'] . $arg;
5136          } else {
5137              $result .= $l['between'] . $arg;
5138          }
5139      }
5140  
5141      return $result . substr( $pattern, 2 );
5142  }
5143  
5144  /**
5145   * Safely extracts not more than the first $count characters from HTML string.
5146   *
5147   * UTF-8, tags and entities safe prefix extraction. Entities inside will *NOT*
5148   * be counted as one character. For example &amp; will be counted as 4, &lt; as
5149   * 3, etc.
5150   *
5151   * @since 2.5.0
5152   *
5153   * @param string $str   String to get the excerpt from.
5154   * @param int    $count Maximum number of characters to take.
5155   * @param string $more  Optional. What to append if $str needs to be trimmed. Defaults to empty string.
5156   * @return string The excerpt.
5157   */
5158  function wp_html_excerpt( $str, $count, $more = null ) {
5159      if ( null === $more ) {
5160          $more = '';
5161      }
5162  
5163      $str     = wp_strip_all_tags( $str, true );
5164      $excerpt = mb_substr( $str, 0, $count );
5165  
5166      // Remove part of an entity at the end.
5167      $excerpt = preg_replace( '/&[^;\s]{0,6}$/', '', $excerpt );
5168      if ( $str != $excerpt ) {
5169          $excerpt = trim( $excerpt ) . $more;
5170      }
5171  
5172      return $excerpt;
5173  }
5174  
5175  /**
5176   * Add a Base url to relative links in passed content.
5177   *
5178   * By default it supports the 'src' and 'href' attributes. However this can be
5179   * changed via the 3rd param.
5180   *
5181   * @since 2.7.0
5182   *
5183   * @global string $_links_add_base
5184   *
5185   * @param string $content String to search for links in.
5186   * @param string $base    The base URL to prefix to links.
5187   * @param array  $attrs   The attributes which should be processed.
5188   * @return string The processed content.
5189   */
5190  function links_add_base_url( $content, $base, $attrs = array( 'src', 'href' ) ) {
5191      global $_links_add_base;
5192      $_links_add_base = $base;
5193      $attrs           = implode( '|', (array) $attrs );
5194      return preg_replace_callback( "!($attrs)=(['\"])(.+?)\\2!i", '_links_add_base', $content );
5195  }
5196  
5197  /**
5198   * Callback to add a base url to relative links in passed content.
5199   *
5200   * @since 2.7.0
5201   * @access private
5202   *
5203   * @global string $_links_add_base
5204   *
5205   * @param string $m The matched link.
5206   * @return string The processed link.
5207   */
5208  function _links_add_base( $m ) {
5209      global $_links_add_base;
5210      // 1 = attribute name  2 = quotation mark  3 = URL.
5211      return $m[1] . '=' . $m[2] .
5212          ( preg_match( '#^(\w{1,20}):#', $m[3], $protocol ) && in_array( $protocol[1], wp_allowed_protocols(), true ) ?
5213              $m[3] :
5214              WP_Http::make_absolute_url( $m[3], $_links_add_base )
5215          )
5216          . $m[2];
5217  }
5218  
5219  /**
5220   * Adds a Target attribute to all links in passed content.
5221   *
5222   * This function by default only applies to `<a>` tags, however this can be
5223   * modified by the 3rd param.
5224   *
5225   * *NOTE:* Any current target attributed will be stripped and replaced.
5226   *
5227   * @since 2.7.0
5228   *
5229   * @global string $_links_add_target
5230   *
5231   * @param string   $content String to search for links in.
5232   * @param string   $target  The Target to add to the links.
5233   * @param string[] $tags    An array of tags to apply to.
5234   * @return string The processed content.
5235   */
5236  function links_add_target( $content, $target = '_blank', $tags = array( 'a' ) ) {
5237      global $_links_add_target;
5238      $_links_add_target = $target;
5239      $tags              = implode( '|', (array) $tags );
5240      return preg_replace_callback( "!<($tags)([^>]*)>!i", '_links_add_target', $content );
5241  }
5242  
5243  /**
5244   * Callback to add a target attribute to all links in passed content.
5245   *
5246   * @since 2.7.0
5247   * @access private
5248   *
5249   * @global string $_links_add_target
5250   *
5251   * @param string $m The matched link.
5252   * @return string The processed link.
5253   */
5254  function _links_add_target( $m ) {
5255      global $_links_add_target;
5256      $tag  = $m[1];
5257      $link = preg_replace( '|( target=([\'"])(.*?)\2)|i', '', $m[2] );
5258      return '<' . $tag . $link . ' target="' . esc_attr( $_links_add_target ) . '">';
5259  }
5260  
5261  /**
5262   * Normalize EOL characters and strip duplicate whitespace.
5263   *
5264   * @since 2.7.0
5265   *
5266   * @param string $str The string to normalize.
5267   * @return string The normalized string.
5268   */
5269  function normalize_whitespace( $str ) {
5270      $str = trim( $str );
5271      $str = str_replace( "\r", "\n", $str );
5272      $str = preg_replace( array( '/\n+/', '/[ \t]+/' ), array( "\n", ' ' ), $str );
5273      return $str;
5274  }
5275  
5276  /**
5277   * Properly strip all HTML tags including script and style
5278   *
5279   * This differs from strip_tags() because it removes the contents of
5280   * the `<script>` and `<style>` tags. E.g. `strip_tags( '<script>something</script>' )`
5281   * will return 'something'. wp_strip_all_tags will return ''
5282   *
5283   * @since 2.9.0
5284   *
5285   * @param string $string        String containing HTML tags
5286   * @param bool   $remove_breaks Optional. Whether to remove left over line breaks and white space chars
5287   * @return string The processed string.
5288   */
5289  function wp_strip_all_tags( $string, $remove_breaks = false ) {
5290      $string = preg_replace( '@<(script|style)[^>]*?>.*?</\\1>@si', '', $string );
5291      $string = strip_tags( $string );
5292  
5293      if ( $remove_breaks ) {
5294          $string = preg_replace( '/[\r\n\t ]+/', ' ', $string );
5295      }
5296  
5297      return trim( $string );
5298  }
5299  
5300  /**
5301   * Sanitizes a string from user input or from the database.
5302   *
5303   * - Checks for invalid UTF-8,
5304   * - Converts single `<` characters to entities
5305   * - Strips all tags
5306   * - Removes line breaks, tabs, and extra whitespace
5307   * - Strips octets
5308   *
5309   * @since 2.9.0
5310   *
5311   * @see sanitize_textarea_field()
5312   * @see wp_check_invalid_utf8()
5313   * @see wp_strip_all_tags()
5314   *
5315   * @param string $str String to sanitize.
5316   * @return string Sanitized string.
5317   */
5318  function sanitize_text_field( $str ) {
5319      $filtered = _sanitize_text_fields( $str, false );
5320  
5321      /**
5322       * Filters a sanitized text field string.
5323       *
5324       * @since 2.9.0
5325       *
5326       * @param string $filtered The sanitized string.
5327       * @param string $str      The string prior to being sanitized.
5328       */
5329      return apply_filters( 'sanitize_text_field', $filtered, $str );
5330  }
5331  
5332  /**
5333   * Sanitizes a multiline string from user input or from the database.
5334   *
5335   * The function is like sanitize_text_field(), but preserves
5336   * new lines (\n) and other whitespace, which are legitimate
5337   * input in textarea elements.
5338   *
5339   * @see sanitize_text_field()
5340   *
5341   * @since 4.7.0
5342   *
5343   * @param string $str String to sanitize.
5344   * @return string Sanitized string.
5345   */
5346  function sanitize_textarea_field( $str ) {
5347      $filtered = _sanitize_text_fields( $str, true );
5348  
5349      /**
5350       * Filters a sanitized textarea field string.
5351       *
5352       * @since 4.7.0
5353       *
5354       * @param string $filtered The sanitized string.
5355       * @param string $str      The string prior to being sanitized.
5356       */
5357      return