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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   * @staticvar array  $static_characters
  33   * @staticvar array  $static_replacements
  34   * @staticvar array  $dynamic_characters
  35   * @staticvar array  $dynamic_replacements
  36   * @staticvar array  $default_no_texturize_tags
  37   * @staticvar array  $default_no_texturize_shortcodes
  38   * @staticvar bool   $run_texturize
  39   * @staticvar string $apos
  40   * @staticvar string $prime
  41   * @staticvar string $double_prime
  42   * @staticvar string $opening_quote
  43   * @staticvar string $closing_quote
  44   * @staticvar string $opening_single_quote
  45   * @staticvar string $closing_single_quote
  46   * @staticvar string $open_q_flag
  47   * @staticvar string $open_sq_flag
  48   * @staticvar string $apos_flag
  49   *
  50   * @param string $text  The text to be formatted.
  51   * @param bool   $reset Set to true for unit testing. Translated patterns will reset.
  52   * @return string The string replaced with HTML entities.
  53   */
  54  function wptexturize( $text, $reset = false ) {
  55      global $wp_cockneyreplace, $shortcode_tags;
  56      static $static_characters            = null,
  57          $static_replacements             = null,
  58          $dynamic_characters              = null,
  59          $dynamic_replacements            = null,
  60          $default_no_texturize_tags       = null,
  61          $default_no_texturize_shortcodes = null,
  62          $run_texturize                   = true,
  63          $apos                            = null,
  64          $prime                           = null,
  65          $double_prime                    = null,
  66          $opening_quote                   = null,
  67          $closing_quote                   = null,
  68          $opening_single_quote            = null,
  69          $closing_single_quote            = null,
  70          $open_q_flag                     = '<!--oq-->',
  71          $open_sq_flag                    = '<!--osq-->',
  72          $apos_flag                       = '<!--apos-->';
  73  
  74      // If there's nothing to do, just stop.
  75      if ( empty( $text ) || false === $run_texturize ) {
  76          return $text;
  77      }
  78  
  79      // Set up static variables. Run once only.
  80      if ( $reset || ! isset( $static_characters ) ) {
  81          /**
  82           * Filters whether to skip running wptexturize().
  83           *
  84           * Passing false to the filter will effectively short-circuit wptexturize().
  85           * returning the original text passed to the function instead.
  86           *
  87           * The filter runs only once, the first time wptexturize() is called.
  88           *
  89           * @since 4.0.0
  90           *
  91           * @see wptexturize()
  92           *
  93           * @param bool $run_texturize Whether to short-circuit wptexturize().
  94           */
  95          $run_texturize = apply_filters( 'run_wptexturize', $run_texturize );
  96          if ( false === $run_texturize ) {
  97              return $text;
  98          }
  99  
 100          /* translators: Opening curly double quote. */
 101          $opening_quote = _x( '&#8220;', 'opening curly double quote' );
 102          /* translators: Closing curly double quote. */
 103          $closing_quote = _x( '&#8221;', 'closing curly double quote' );
 104  
 105          /* translators: Apostrophe, for example in 'cause or can't. */
 106          $apos = _x( '&#8217;', 'apostrophe' );
 107  
 108          /* translators: Prime, for example in 9' (nine feet). */
 109          $prime = _x( '&#8242;', 'prime' );
 110          /* translators: Double prime, for example in 9" (nine inches). */
 111          $double_prime = _x( '&#8243;', 'double prime' );
 112  
 113          /* translators: Opening curly single quote. */
 114          $opening_single_quote = _x( '&#8216;', 'opening curly single quote' );
 115          /* translators: Closing curly single quote. */
 116          $closing_single_quote = _x( '&#8217;', 'closing curly single quote' );
 117  
 118          /* translators: En dash. */
 119          $en_dash = _x( '&#8211;', 'en dash' );
 120          /* translators: Em dash. */
 121          $em_dash = _x( '&#8212;', 'em dash' );
 122  
 123          $default_no_texturize_tags       = array( 'pre', 'code', 'kbd', 'style', 'script', 'tt' );
 124          $default_no_texturize_shortcodes = array( 'code' );
 125  
 126          // if a plugin has provided an autocorrect array, use it
 127          if ( isset( $wp_cockneyreplace ) ) {
 128              $cockney        = array_keys( $wp_cockneyreplace );
 129              $cockneyreplace = array_values( $wp_cockneyreplace );
 130          } else {
 131              /*
 132               * translators: This is a comma-separated list of words that defy the syntax of quotations in normal use,
 133               * for example...  'We do not have enough words yet' ... is a typical quoted phrase.  But when we write
 134               * lines of code 'til we have enough of 'em, then we need to insert apostrophes instead of quotes.
 135               */
 136              $cockney = explode(
 137                  ',',
 138                  _x(
 139                      "'tain't,'twere,'twas,'tis,'twill,'til,'bout,'nuff,'round,'cause,'em",
 140                      'Comma-separated list of words to texturize in your language'
 141                  )
 142              );
 143  
 144              $cockneyreplace = explode(
 145                  ',',
 146                  _x(
 147                      '&#8217;tain&#8217;t,&#8217;twere,&#8217;twas,&#8217;tis,&#8217;twill,&#8217;til,&#8217;bout,&#8217;nuff,&#8217;round,&#8217;cause,&#8217;em',
 148                      'Comma-separated list of replacement words in your language'
 149                  )
 150              );
 151          }
 152  
 153          $static_characters   = array_merge( array( '...', '``', '\'\'', ' (tm)' ), $cockney );
 154          $static_replacements = array_merge( array( '&#8230;', $opening_quote, $closing_quote, ' &#8482;' ), $cockneyreplace );
 155  
 156          // Pattern-based replacements of characters.
 157          // Sort the remaining patterns into several arrays for performance tuning.
 158          $dynamic_characters   = array(
 159              'apos'  => array(),
 160              'quote' => array(),
 161              'dash'  => array(),
 162          );
 163          $dynamic_replacements = array(
 164              'apos'  => array(),
 165              'quote' => array(),
 166              'dash'  => array(),
 167          );
 168          $dynamic              = array();
 169          $spaces               = wp_spaces_regexp();
 170  
 171          // '99' and '99" are ambiguous among other patterns; assume it's an abbreviated year at the end of a quotation.
 172          if ( "'" !== $apos || "'" !== $closing_single_quote ) {
 173              $dynamic[ '/\'(\d\d)\'(?=\Z|[.,:;!?)}\-\]]|&gt;|' . $spaces . ')/' ] = $apos_flag . '$1' . $closing_single_quote;
 174          }
 175          if ( "'" !== $apos || '"' !== $closing_quote ) {
 176              $dynamic[ '/\'(\d\d)"(?=\Z|[.,:;!?)}\-\]]|&gt;|' . $spaces . ')/' ] = $apos_flag . '$1' . $closing_quote;
 177          }
 178  
 179          // '99 '99s '99's (apostrophe)  But never '9 or '99% or '999 or '99.0.
 180          if ( "'" !== $apos ) {
 181              $dynamic['/\'(?=\d\d(?:\Z|(?![%\d]|[.,]\d)))/'] = $apos_flag;
 182          }
 183  
 184          // Quoted Numbers like '0.42'
 185          if ( "'" !== $opening_single_quote && "'" !== $closing_single_quote ) {
 186              $dynamic[ '/(?<=\A|' . $spaces . ')\'(\d[.,\d]*)\'/' ] = $open_sq_flag . '$1' . $closing_single_quote;
 187          }
 188  
 189          // Single quote at start, or preceded by (, {, <, [, ", -, or spaces.
 190          if ( "'" !== $opening_single_quote ) {
 191              $dynamic[ '/(?<=\A|[([{"\-]|&lt;|' . $spaces . ')\'/' ] = $open_sq_flag;
 192          }
 193  
 194          // Apostrophe in a word.  No spaces, double apostrophes, or other punctuation.
 195          if ( "'" !== $apos ) {
 196              $dynamic[ '/(?<!' . $spaces . ')\'(?!\Z|[.,:;!?"\'(){}[\]\-]|&[lg]t;|' . $spaces . ')/' ] = $apos_flag;
 197          }
 198  
 199          $dynamic_characters['apos']   = array_keys( $dynamic );
 200          $dynamic_replacements['apos'] = array_values( $dynamic );
 201          $dynamic                      = array();
 202  
 203          // Quoted Numbers like "42"
 204          if ( '"' !== $opening_quote && '"' !== $closing_quote ) {
 205              $dynamic[ '/(?<=\A|' . $spaces . ')"(\d[.,\d]*)"/' ] = $open_q_flag . '$1' . $closing_quote;
 206          }
 207  
 208          // Double quote at start, or preceded by (, {, <, [, -, or spaces, and not followed by spaces.
 209          if ( '"' !== $opening_quote ) {
 210              $dynamic[ '/(?<=\A|[([{\-]|&lt;|' . $spaces . ')"(?!' . $spaces . ')/' ] = $open_q_flag;
 211          }
 212  
 213          $dynamic_characters['quote']   = array_keys( $dynamic );
 214          $dynamic_replacements['quote'] = array_values( $dynamic );
 215          $dynamic                       = array();
 216  
 217          // Dashes and spaces
 218          $dynamic['/---/'] = $em_dash;
 219          $dynamic[ '/(?<=^|' . $spaces . ')--(?=$|' . $spaces . ')/' ] = $em_dash;
 220          $dynamic['/(?<!xn)--/']                                       = $en_dash;
 221          $dynamic[ '/(?<=^|' . $spaces . ')-(?=$|' . $spaces . ')/' ]  = $en_dash;
 222  
 223          $dynamic_characters['dash']   = array_keys( $dynamic );
 224          $dynamic_replacements['dash'] = array_values( $dynamic );
 225      }
 226  
 227      // Must do this every time in case plugins use these filters in a context sensitive manner
 228      /**
 229       * Filters the list of HTML elements not to texturize.
 230       *
 231       * @since 2.8.0
 232       *
 233       * @param string[] $default_no_texturize_tags An array of HTML element names.
 234       */
 235      $no_texturize_tags = apply_filters( 'no_texturize_tags', $default_no_texturize_tags );
 236      /**
 237       * Filters the list of shortcodes not to texturize.
 238       *
 239       * @since 2.8.0
 240       *
 241       * @param string[] $default_no_texturize_shortcodes An array of shortcode names.
 242       */
 243      $no_texturize_shortcodes = apply_filters( 'no_texturize_shortcodes', $default_no_texturize_shortcodes );
 244  
 245      $no_texturize_tags_stack       = array();
 246      $no_texturize_shortcodes_stack = array();
 247  
 248      // Look for shortcodes and HTML elements.
 249  
 250      preg_match_all( '@\[/?([^<>&/\[\]\x00-\x20=]++)@', $text, $matches );
 251      $tagnames         = array_intersect( array_keys( $shortcode_tags ), $matches[1] );
 252      $found_shortcodes = ! empty( $tagnames );
 253      $shortcode_regex  = $found_shortcodes ? _get_wptexturize_shortcode_regex( $tagnames ) : '';
 254      $regex            = _get_wptexturize_split_regex( $shortcode_regex );
 255  
 256      $textarr = preg_split( $regex, $text, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
 257  
 258      foreach ( $textarr as &$curl ) {
 259          // Only call _wptexturize_pushpop_element if $curl is a delimiter.
 260          $first = $curl[0];
 261          if ( '<' === $first ) {
 262              if ( '<!--' === substr( $curl, 0, 4 ) ) {
 263                  // This is an HTML comment delimiter.
 264                  continue;
 265              } else {
 266                  // This is an HTML element delimiter.
 267  
 268                  // Replace each & with &#038; unless it already looks like an entity.
 269                  $curl = preg_replace( '/&(?!#(?:\d+|x[a-f0-9]+);|[a-z1-4]{1,8};)/i', '&#038;', $curl );
 270  
 271                  _wptexturize_pushpop_element( $curl, $no_texturize_tags_stack, $no_texturize_tags );
 272              }
 273          } elseif ( '' === trim( $curl ) ) {
 274              // This is a newline between delimiters.  Performance improves when we check this.
 275              continue;
 276  
 277          } elseif ( '[' === $first && $found_shortcodes && 1 === preg_match( '/^' . $shortcode_regex . '$/', $curl ) ) {
 278              // This is a shortcode delimiter.
 279  
 280              if ( '[[' !== substr( $curl, 0, 2 ) && ']]' !== substr( $curl, -2 ) ) {
 281                  // Looks like a normal shortcode.
 282                  _wptexturize_pushpop_element( $curl, $no_texturize_shortcodes_stack, $no_texturize_shortcodes );
 283              } else {
 284                  // Looks like an escaped shortcode.
 285                  continue;
 286              }
 287          } elseif ( empty( $no_texturize_shortcodes_stack ) && empty( $no_texturize_tags_stack ) ) {
 288              // This is neither a delimiter, nor is this content inside of no_texturize pairs.  Do texturize.
 289  
 290              $curl = str_replace( $static_characters, $static_replacements, $curl );
 291  
 292              if ( false !== strpos( $curl, "'" ) ) {
 293                  $curl = preg_replace( $dynamic_characters['apos'], $dynamic_replacements['apos'], $curl );
 294                  $curl = wptexturize_primes( $curl, "'", $prime, $open_sq_flag, $closing_single_quote );
 295                  $curl = str_replace( $apos_flag, $apos, $curl );
 296                  $curl = str_replace( $open_sq_flag, $opening_single_quote, $curl );
 297              }
 298              if ( false !== strpos( $curl, '"' ) ) {
 299                  $curl = preg_replace( $dynamic_characters['quote'], $dynamic_replacements['quote'], $curl );
 300                  $curl = wptexturize_primes( $curl, '"', $double_prime, $open_q_flag, $closing_quote );
 301                  $curl = str_replace( $open_q_flag, $opening_quote, $curl );
 302              }
 303              if ( false !== strpos( $curl, '-' ) ) {
 304                  $curl = preg_replace( $dynamic_characters['dash'], $dynamic_replacements['dash'], $curl );
 305              }
 306  
 307              // 9x9 (times), but never 0x9999
 308              if ( 1 === preg_match( '/(?<=\d)x\d/', $curl ) ) {
 309                  // Searching for a digit is 10 times more expensive than for the x, so we avoid doing this one!
 310                  $curl = preg_replace( '/\b(\d(?(?<=0)[\d\.,]+|[\d\.,]*))x(\d[\d\.,]*)\b/', '$1&#215;$2', $curl );
 311              }
 312  
 313              // Replace each & with &#038; unless it already looks like an entity.
 314              $curl = preg_replace( '/&(?!#(?:\d+|x[a-f0-9]+);|[a-z1-4]{1,8};)/i', '&#038;', $curl );
 315          }
 316      }
 317  
 318      return implode( '', $textarr );
 319  }
 320  
 321  /**
 322   * Implements a logic tree to determine whether or not "7'." represents seven feet,
 323   * then converts the special char into either a prime char or a closing quote char.
 324   *
 325   * @since 4.3.0
 326   *
 327   * @param string $haystack    The plain text to be searched.
 328   * @param string $needle      The character to search for such as ' or ".
 329   * @param string $prime       The prime char to use for replacement.
 330   * @param string $open_quote  The opening quote char. Opening quote replacement must be
 331   *                            accomplished already.
 332   * @param string $close_quote The closing quote char to use for replacement.
 333   * @return string The $haystack value after primes and quotes replacements.
 334   */
 335  function wptexturize_primes( $haystack, $needle, $prime, $open_quote, $close_quote ) {
 336      $spaces           = wp_spaces_regexp();
 337      $flag             = '<!--wp-prime-or-quote-->';
 338      $quote_pattern    = "/$needle(?=\\Z|[.,:;!?)}\\-\\]]|&gt;|" . $spaces . ')/';
 339      $prime_pattern    = "/(?<=\\d)$needle/";
 340      $flag_after_digit = "/(?<=\\d)$flag/";
 341      $flag_no_digit    = "/(?<!\\d)$flag/";
 342  
 343      $sentences = explode( $open_quote, $haystack );
 344  
 345      foreach ( $sentences as $key => &$sentence ) {
 346          if ( false === strpos( $sentence, $needle ) ) {
 347              continue;
 348          } elseif ( 0 !== $key && 0 === substr_count( $sentence, $close_quote ) ) {
 349              $sentence = preg_replace( $quote_pattern, $flag, $sentence, -1, $count );
 350              if ( $count > 1 ) {
 351                  // This sentence appears to have multiple closing quotes.  Attempt Vulcan logic.
 352                  $sentence = preg_replace( $flag_no_digit, $close_quote, $sentence, -1, $count2 );
 353                  if ( 0 === $count2 ) {
 354                      // Try looking for a quote followed by a period.
 355                      $count2 = substr_count( $sentence, "$flag." );
 356                      if ( $count2 > 0 ) {
 357                          // Assume the rightmost quote-period match is the end of quotation.
 358                          $pos = strrpos( $sentence, "$flag." );
 359                      } else {
 360                          // When all else fails, make the rightmost candidate a closing quote.
 361                          // This is most likely to be problematic in the context of bug #18549.
 362                          $pos = strrpos( $sentence, $flag );
 363                      }
 364                      $sentence = substr_replace( $sentence, $close_quote, $pos, strlen( $flag ) );
 365                  }
 366                  // Use conventional replacement on any remaining primes and quotes.
 367                  $sentence = preg_replace( $prime_pattern, $prime, $sentence );
 368                  $sentence = preg_replace( $flag_after_digit, $prime, $sentence );
 369                  $sentence = str_replace( $flag, $close_quote, $sentence );
 370              } elseif ( 1 == $count ) {
 371                  // Found only one closing quote candidate, so give it priority over primes.
 372                  $sentence = str_replace( $flag, $close_quote, $sentence );
 373                  $sentence = preg_replace( $prime_pattern, $prime, $sentence );
 374              } else {
 375                  // No closing quotes found.  Just run primes pattern.
 376                  $sentence = preg_replace( $prime_pattern, $prime, $sentence );
 377              }
 378          } else {
 379              $sentence = preg_replace( $prime_pattern, $prime, $sentence );
 380              $sentence = preg_replace( $quote_pattern, $close_quote, $sentence );
 381          }
 382          if ( '"' == $needle && false !== strpos( $sentence, '"' ) ) {
 383              $sentence = str_replace( '"', $close_quote, $sentence );
 384          }
 385      }
 386  
 387      return implode( $open_quote, $sentences );
 388  }
 389  
 390  /**
 391   * Search for disabled element tags. Push element to stack on tag open and pop
 392   * on tag close.
 393   *
 394   * Assumes first char of $text is tag opening and last char is tag closing.
 395   * Assumes second char of $text is optionally '/' to indicate closing as in </html>.
 396   *
 397   * @since 2.9.0
 398   * @access private
 399   *
 400   * @param string   $text              Text to check. Must be a tag like `<html>` or `[shortcode]`.
 401   * @param string[] $stack             Array of open tag elements.
 402   * @param string[] $disabled_elements Array of tag names to match against. Spaces are not allowed in tag names.
 403   */
 404  function _wptexturize_pushpop_element( $text, &$stack, $disabled_elements ) {
 405      // Is it an opening tag or closing tag?
 406      if ( isset( $text[1] ) && '/' !== $text[1] ) {
 407          $opening_tag = true;
 408          $name_offset = 1;
 409      } elseif ( 0 == count( $stack ) ) {
 410          // Stack is empty. Just stop.
 411          return;
 412      } else {
 413          $opening_tag = false;
 414          $name_offset = 2;
 415      }
 416  
 417      // Parse out the tag name.
 418      $space = strpos( $text, ' ' );
 419      if ( false === $space ) {
 420          $space = -1;
 421      } else {
 422          $space -= $name_offset;
 423      }
 424      $tag = substr( $text, $name_offset, $space );
 425  
 426      // Handle disabled tags.
 427      if ( in_array( $tag, $disabled_elements ) ) {
 428          if ( $opening_tag ) {
 429              /*
 430               * This disables texturize until we find a closing tag of our type
 431               * (e.g. <pre>) even if there was invalid nesting before that
 432               *
 433               * Example: in the case <pre>sadsadasd</code>"baba"</pre>
 434               *          "baba" won't be texturize
 435               */
 436  
 437              array_push( $stack, $tag );
 438          } elseif ( end( $stack ) == $tag ) {
 439              array_pop( $stack );
 440          }
 441      }
 442  }
 443  
 444  /**
 445   * Replaces double line-breaks with paragraph elements.
 446   *
 447   * A group of regex replaces used to identify text formatted with newlines and
 448   * replace double line-breaks with HTML paragraph tags. The remaining line-breaks
 449   * after conversion become <<br />> tags, unless $br is set to '0' or 'false'.
 450   *
 451   * @since 0.71
 452   *
 453   * @param string $pee The text which has to be formatted.
 454   * @param bool   $br  Optional. If set, this will convert all remaining line-breaks
 455   *                    after paragraphing. Default true.
 456   * @return string Text which has been converted into correct paragraph tags.
 457   */
 458  function wpautop( $pee, $br = true ) {
 459      $pre_tags = array();
 460  
 461      if ( trim( $pee ) === '' ) {
 462          return '';
 463      }
 464  
 465      // Just to make things a little easier, pad the end.
 466      $pee = $pee . "\n";
 467  
 468      /*
 469       * Pre tags shouldn't be touched by autop.
 470       * Replace pre tags with placeholders and bring them back after autop.
 471       */
 472      if ( strpos( $pee, '<pre' ) !== false ) {
 473          $pee_parts = explode( '</pre>', $pee );
 474          $last_pee  = array_pop( $pee_parts );
 475          $pee       = '';
 476          $i         = 0;
 477  
 478          foreach ( $pee_parts as $pee_part ) {
 479              $start = strpos( $pee_part, '<pre' );
 480  
 481              // Malformed html?
 482              if ( $start === false ) {
 483                  $pee .= $pee_part;
 484                  continue;
 485              }
 486  
 487              $name              = "<pre wp-pre-tag-$i></pre>";
 488              $pre_tags[ $name ] = substr( $pee_part, $start ) . '</pre>';
 489  
 490              $pee .= substr( $pee_part, 0, $start ) . $name;
 491              $i++;
 492          }
 493  
 494          $pee .= $last_pee;
 495      }
 496      // Change multiple <br>s into two line breaks, which will turn into paragraphs.
 497      $pee = preg_replace( '|<br\s*/?>\s*<br\s*/?>|', "\n\n", $pee );
 498  
 499      $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)';
 500  
 501      // Add a double line break above block-level opening tags.
 502      $pee = preg_replace( '!(<' . $allblocks . '[\s/>])!', "\n\n$1", $pee );
 503  
 504      // Add a double line break below block-level closing tags.
 505      $pee = preg_replace( '!(</' . $allblocks . '>)!', "$1\n\n", $pee );
 506  
 507      // Add a double line break after hr tags, which are self closing.
 508      $pee = preg_replace( '!(<hr\s*?/?>)!', "$1\n\n", $pee );
 509  
 510      // Standardize newline characters to "\n".
 511      $pee = str_replace( array( "\r\n", "\r" ), "\n", $pee );
 512  
 513      // Find newlines in all elements and add placeholders.
 514      $pee = wp_replace_in_html_tags( $pee, array( "\n" => ' <!-- wpnl --> ' ) );
 515  
 516      // Collapse line breaks before and after <option> elements so they don't get autop'd.
 517      if ( strpos( $pee, '<option' ) !== false ) {
 518          $pee = preg_replace( '|\s*<option|', '<option', $pee );
 519          $pee = preg_replace( '|</option>\s*|', '</option>', $pee );
 520      }
 521  
 522      /*
 523       * Collapse line breaks inside <object> elements, before <param> and <embed> elements
 524       * so they don't get autop'd.
 525       */
 526      if ( strpos( $pee, '</object>' ) !== false ) {
 527          $pee = preg_replace( '|(<object[^>]*>)\s*|', '$1', $pee );
 528          $pee = preg_replace( '|\s*</object>|', '</object>', $pee );
 529          $pee = preg_replace( '%\s*(</?(?:param|embed)[^>]*>)\s*%', '$1', $pee );
 530      }
 531  
 532      /*
 533       * Collapse line breaks inside <audio> and <video> elements,
 534       * before and after <source> and <track> elements.
 535       */
 536      if ( strpos( $pee, '<source' ) !== false || strpos( $pee, '<track' ) !== false ) {
 537          $pee = preg_replace( '%([<\[](?:audio|video)[^>\]]*[>\]])\s*%', '$1', $pee );
 538          $pee = preg_replace( '%\s*([<\[]/(?:audio|video)[>\]])%', '$1', $pee );
 539          $pee = preg_replace( '%\s*(<(?:source|track)[^>]*>)\s*%', '$1', $pee );
 540      }
 541  
 542      // Collapse line breaks before and after <figcaption> elements.
 543      if ( strpos( $pee, '<figcaption' ) !== false ) {
 544          $pee = preg_replace( '|\s*(<figcaption[^>]*>)|', '$1', $pee );
 545          $pee = preg_replace( '|</figcaption>\s*|', '</figcaption>', $pee );
 546      }
 547  
 548      // Remove more than two contiguous line breaks.
 549      $pee = preg_replace( "/\n\n+/", "\n\n", $pee );
 550  
 551      // Split up the contents into an array of strings, separated by double line breaks.
 552      $pees = preg_split( '/\n\s*\n/', $pee, -1, PREG_SPLIT_NO_EMPTY );
 553  
 554      // Reset $pee prior to rebuilding.
 555      $pee = '';
 556  
 557      // Rebuild the content as a string, wrapping every bit with a <p>.
 558      foreach ( $pees as $tinkle ) {
 559          $pee .= '<p>' . trim( $tinkle, "\n" ) . "</p>\n";
 560      }
 561  
 562      // Under certain strange conditions it could create a P of entirely whitespace.
 563      $pee = preg_replace( '|<p>\s*</p>|', '', $pee );
 564  
 565      // Add a closing <p> inside <div>, <address>, or <form> tag if missing.
 566      $pee = preg_replace( '!<p>([^<]+)</(div|address|form)>!', '<p>$1</p></$2>', $pee );
 567  
 568      // If an opening or closing block element tag is wrapped in a <p>, unwrap it.
 569      $pee = preg_replace( '!<p>\s*(</?' . $allblocks . '[^>]*>)\s*</p>!', '$1', $pee );
 570  
 571      // In some cases <li> may get wrapped in <p>, fix them.
 572      $pee = preg_replace( '|<p>(<li.+?)</p>|', '$1', $pee );
 573  
 574      // If a <blockquote> is wrapped with a <p>, move it inside the <blockquote>.
 575      $pee = preg_replace( '|<p><blockquote([^>]*)>|i', '<blockquote$1><p>', $pee );
 576      $pee = str_replace( '</blockquote></p>', '</p></blockquote>', $pee );
 577  
 578      // If an opening or closing block element tag is preceded by an opening <p> tag, remove it.
 579      $pee = preg_replace( '!<p>\s*(</?' . $allblocks . '[^>]*>)!', '$1', $pee );
 580  
 581      // If an opening or closing block element tag is followed by a closing <p> tag, remove it.
 582      $pee = preg_replace( '!(</?' . $allblocks . '[^>]*>)\s*</p>!', '$1', $pee );
 583  
 584      // Optionally insert line breaks.
 585      if ( $br ) {
 586          // Replace newlines that shouldn't be touched with a placeholder.
 587          $pee = preg_replace_callback( '/<(script|style|svg).*?<\/\\1>/s', '_autop_newline_preservation_helper', $pee );
 588  
 589          // Normalize <br>
 590          $pee = str_replace( array( '<br>', '<br/>' ), '<br />', $pee );
 591  
 592          // Replace any new line characters that aren't preceded by a <br /> with a <br />.
 593          $pee = preg_replace( '|(?<!<br />)\s*\n|', "<br />\n", $pee );
 594  
 595          // Replace newline placeholders with newlines.
 596          $pee = str_replace( '<WPPreserveNewline />', "\n", $pee );
 597      }
 598  
 599      // If a <br /> tag is after an opening or closing block tag, remove it.
 600      $pee = preg_replace( '!(</?' . $allblocks . '[^>]*>)\s*<br />!', '$1', $pee );
 601  
 602      // If a <br /> tag is before a subset of opening or closing block tags, remove it.
 603      $pee = preg_replace( '!<br />(\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)[^>]*>)!', '$1', $pee );
 604      $pee = preg_replace( "|\n</p>$|", '</p>', $pee );
 605  
 606      // Replace placeholder <pre> tags with their original content.
 607      if ( ! empty( $pre_tags ) ) {
 608          $pee = str_replace( array_keys( $pre_tags ), array_values( $pre_tags ), $pee );
 609      }
 610  
 611      // Restore newlines in all elements.
 612      if ( false !== strpos( $pee, '<!-- wpnl -->' ) ) {
 613          $pee = str_replace( array( ' <!-- wpnl --> ', '<!-- wpnl -->' ), "\n", $pee );
 614      }
 615  
 616      return $pee;
 617  }
 618  
 619  /**
 620   * Separate HTML elements and comments from the text.
 621   *
 622   * @since 4.2.4
 623   *
 624   * @param string $input The text which has to be formatted.
 625   * @return string[] Array of the formatted text.
 626   */
 627  function wp_html_split( $input ) {
 628      return preg_split( get_html_split_regex(), $input, -1, PREG_SPLIT_DELIM_CAPTURE );
 629  }
 630  
 631  /**
 632   * Retrieve the regular expression for an HTML element.
 633   *
 634   * @since 4.4.0
 635   *
 636   * @staticvar string $regex
 637   *
 638   * @return string The regular expression
 639   */
 640  function get_html_split_regex() {
 641      static $regex;
 642  
 643      if ( ! isset( $regex ) ) {
 644          // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
 645          $comments =
 646              '!'             // Start of comment, after the <.
 647              . '(?:'         // Unroll the loop: Consume everything until --> is found.
 648              .     '-(?!->)' // Dash not followed by end of comment.
 649              .     '[^\-]*+' // Consume non-dashes.
 650              . ')*+'         // Loop possessively.
 651              . '(?:-->)?';   // End of comment. If not found, match all input.
 652  
 653          $cdata =
 654              '!\[CDATA\['    // Start of comment, after the <.
 655              . '[^\]]*+'     // Consume non-].
 656              . '(?:'         // Unroll the loop: Consume everything until ]]> is found.
 657              .     '](?!]>)' // One ] not followed by end of comment.
 658              .     '[^\]]*+' // Consume non-].
 659              . ')*+'         // Loop possessively.
 660              . '(?:]]>)?';   // End of comment. If not found, match all input.
 661  
 662          $escaped =
 663              '(?='             // Is the element escaped?
 664              .    '!--'
 665              . '|'
 666              .    '!\[CDATA\['
 667              . ')'
 668              . '(?(?=!-)'      // If yes, which type?
 669              .     $comments
 670              . '|'
 671              .     $cdata
 672              . ')';
 673  
 674          $regex =
 675              '/('                // Capture the entire match.
 676              .     '<'           // Find start of element.
 677              .     '(?'          // Conditional expression follows.
 678              .         $escaped  // Find end of escaped element.
 679              .     '|'           // ... else ...
 680              .         '[^>]*>?' // Find end of normal element.
 681              .     ')'
 682              . ')/';
 683          // phpcs:enable
 684      }
 685  
 686      return $regex;
 687  }
 688  
 689  /**
 690   * Retrieve the combined regular expression for HTML and shortcodes.
 691   *
 692   * @access private
 693   * @ignore
 694   * @internal This function will be removed in 4.5.0 per Shortcode API Roadmap.
 695   * @since 4.4.0
 696   *
 697   * @staticvar string $html_regex
 698   *
 699   * @param string $shortcode_regex The result from _get_wptexturize_shortcode_regex().  Optional.
 700   * @return string The regular expression
 701   */
 702  function _get_wptexturize_split_regex( $shortcode_regex = '' ) {
 703      static $html_regex;
 704  
 705      if ( ! isset( $html_regex ) ) {
 706          // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
 707          $comment_regex =
 708              '!'             // Start of comment, after the <.
 709              . '(?:'         // Unroll the loop: Consume everything until --> is found.
 710              .     '-(?!->)' // Dash not followed by end of comment.
 711              .     '[^\-]*+' // Consume non-dashes.
 712              . ')*+'         // Loop possessively.
 713              . '(?:-->)?';   // End of comment. If not found, match all input.
 714  
 715          $html_regex = // Needs replaced with wp_html_split() per Shortcode API Roadmap.
 716              '<'                  // Find start of element.
 717              . '(?(?=!--)'        // Is this a comment?
 718              .     $comment_regex // Find end of comment.
 719              . '|'
 720              .     '[^>]*>?'      // Find end of element. If not found, match all input.
 721              . ')';
 722          // phpcs:enable
 723      }
 724  
 725      if ( empty( $shortcode_regex ) ) {
 726          $regex = '/(' . $html_regex . ')/';
 727      } else {
 728          $regex = '/(' . $html_regex . '|' . $shortcode_regex . ')/';
 729      }
 730  
 731      return $regex;
 732  }
 733  
 734  /**
 735   * Retrieve the regular expression for shortcodes.
 736   *
 737   * @access private
 738   * @ignore
 739   * @since 4.4.0
 740   *
 741   * @param string[] $tagnames Array of shortcodes to find.
 742   * @return string The regular expression
 743   */
 744  function _get_wptexturize_shortcode_regex( $tagnames ) {
 745      $tagregexp = join( '|', array_map( 'preg_quote', $tagnames ) );
 746      $tagregexp = "(?:$tagregexp)(?=[\\s\\]\\/])"; // Excerpt of get_shortcode_regex().
 747      // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
 748      $regex =
 749          '\['              // Find start of shortcode.
 750          . '[\/\[]?'         // Shortcodes may begin with [/ or [[
 751          . $tagregexp        // Only match registered shortcodes, because performance.
 752          . '(?:'
 753          .     '[^\[\]<>]+'  // Shortcodes do not contain other shortcodes. Quantifier critical.
 754          . '|'
 755          .     '<[^\[\]>]*>' // HTML elements permitted. Prevents matching ] before >.
 756          . ')*+'             // Possessive critical.
 757          . '\]'              // Find end of shortcode.
 758          . '\]?';            // Shortcodes may end with ]]
 759      // phpcs:enable
 760  
 761      return $regex;
 762  }
 763  
 764  /**
 765   * Replace characters or phrases within HTML elements only.
 766   *
 767   * @since 4.2.3
 768   *
 769   * @param string $haystack The text which has to be formatted.
 770   * @param array $replace_pairs In the form array('from' => 'to', ...).
 771   * @return string The formatted text.
 772   */
 773  function wp_replace_in_html_tags( $haystack, $replace_pairs ) {
 774      // Find all elements.
 775      $textarr = wp_html_split( $haystack );
 776      $changed = false;
 777  
 778      // Optimize when searching for one item.
 779      if ( 1 === count( $replace_pairs ) ) {
 780          // Extract $needle and $replace.
 781          foreach ( $replace_pairs as $needle => $replace ) {
 782          }
 783  
 784          // Loop through delimiters (elements) only.
 785          for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {
 786              if ( false !== strpos( $textarr[ $i ], $needle ) ) {
 787                  $textarr[ $i ] = str_replace( $needle, $replace, $textarr[ $i ] );
 788                  $changed       = true;
 789              }
 790          }
 791      } else {
 792          // Extract all $needles.
 793          $needles = array_keys( $replace_pairs );
 794  
 795          // Loop through delimiters (elements) only.
 796          for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {
 797              foreach ( $needles as $needle ) {
 798                  if ( false !== strpos( $textarr[ $i ], $needle ) ) {
 799                      $textarr[ $i ] = strtr( $textarr[ $i ], $replace_pairs );
 800                      $changed       = true;
 801                      // After one strtr() break out of the foreach loop and look at next element.
 802                      break;
 803                  }
 804              }
 805          }
 806      }
 807  
 808      if ( $changed ) {
 809          $haystack = implode( $textarr );
 810      }
 811  
 812      return $haystack;
 813  }
 814  
 815  /**
 816   * Newline preservation help function for wpautop
 817   *
 818   * @since 3.1.0
 819   * @access private
 820   *
 821   * @param array $matches preg_replace_callback matches array
 822   * @return string
 823   */
 824  function _autop_newline_preservation_helper( $matches ) {
 825      return str_replace( "\n", '<WPPreserveNewline />', $matches[0] );
 826  }
 827  
 828  /**
 829   * Don't auto-p wrap shortcodes that stand alone
 830   *
 831   * Ensures that shortcodes are not wrapped in `<p>...</p>`.
 832   *
 833   * @since 2.9.0
 834   *
 835   * @global array $shortcode_tags
 836   *
 837   * @param string $pee The content.
 838   * @return string The filtered content.
 839   */
 840  function shortcode_unautop( $pee ) {
 841      global $shortcode_tags;
 842  
 843      if ( empty( $shortcode_tags ) || ! is_array( $shortcode_tags ) ) {
 844          return $pee;
 845      }
 846  
 847      $tagregexp = join( '|', array_map( 'preg_quote', array_keys( $shortcode_tags ) ) );
 848      $spaces    = wp_spaces_regexp();
 849  
 850      // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound,WordPress.WhiteSpace.PrecisionAlignment.Found -- don't remove regex indentation
 851      $pattern =
 852          '/'
 853          . '<p>'                              // Opening paragraph
 854          . '(?:' . $spaces . ')*+'            // Optional leading whitespace
 855          . '('                                // 1: The shortcode
 856          .     '\\['                          // Opening bracket
 857          .     "($tagregexp)"                 // 2: Shortcode name
 858          .     '(?![\\w-])'                   // Not followed by word character or hyphen
 859                                               // Unroll the loop: Inside the opening shortcode tag
 860          .     '[^\\]\\/]*'                   // Not a closing bracket or forward slash
 861          .     '(?:'
 862          .         '\\/(?!\\])'               // A forward slash not followed by a closing bracket
 863          .         '[^\\]\\/]*'               // Not a closing bracket or forward slash
 864          .     ')*?'
 865          .     '(?:'
 866          .         '\\/\\]'                   // Self closing tag and closing bracket
 867          .     '|'
 868          .         '\\]'                      // Closing bracket
 869          .         '(?:'                      // Unroll the loop: Optionally, anything between the opening and closing shortcode tags
 870          .             '[^\\[]*+'             // Not an opening bracket
 871          .             '(?:'
 872          .                 '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag
 873          .                 '[^\\[]*+'         // Not an opening bracket
 874          .             ')*+'
 875          .             '\\[\\/\\2\\]'         // Closing shortcode tag
 876          .         ')?'
 877          .     ')'
 878          . ')'
 879          . '(?:' . $spaces . ')*+'            // optional trailing whitespace
 880          . '<\\/p>'                           // closing paragraph
 881          . '/';
 882      // phpcs:enable
 883  
 884      return preg_replace( $pattern, '$1', $pee );
 885  }
 886  
 887  /**
 888   * Checks to see if a string is utf8 encoded.
 889   *
 890   * NOTE: This function checks for 5-Byte sequences, UTF8
 891   *       has Bytes Sequences with a maximum length of 4.
 892   *
 893   * @author bmorel at ssi dot fr (modified)
 894   * @since 1.2.1
 895   *
 896   * @param string $str The string to be checked
 897   * @return bool True if $str fits a UTF-8 model, false otherwise.
 898   */
 899  function seems_utf8( $str ) {
 900      mbstring_binary_safe_encoding();
 901      $length = strlen( $str );
 902      reset_mbstring_encoding();
 903      for ( $i = 0; $i < $length; $i++ ) {
 904          $c = ord( $str[ $i ] );
 905          if ( $c < 0x80 ) {
 906              $n = 0; // 0bbbbbbb
 907          } elseif ( ( $c & 0xE0 ) == 0xC0 ) {
 908              $n = 1; // 110bbbbb
 909          } elseif ( ( $c & 0xF0 ) == 0xE0 ) {
 910              $n = 2; // 1110bbbb
 911          } elseif ( ( $c & 0xF8 ) == 0xF0 ) {
 912              $n = 3; // 11110bbb
 913          } elseif ( ( $c & 0xFC ) == 0xF8 ) {
 914              $n = 4; // 111110bb
 915          } elseif ( ( $c & 0xFE ) == 0xFC ) {
 916              $n = 5; // 1111110b
 917          } else {
 918              return false; // Does not match any model
 919          }
 920          for ( $j = 0; $j < $n; $j++ ) { // n bytes matching 10bbbbbb follow ?
 921              if ( ( ++$i == $length ) || ( ( ord( $str[ $i ] ) & 0xC0 ) != 0x80 ) ) {
 922                  return false;
 923              }
 924          }
 925      }
 926      return true;
 927  }
 928  
 929  /**
 930   * Converts a number of special characters into their HTML entities.
 931   *
 932   * Specifically deals with: &, <, >, ", and '.
 933   *
 934   * $quote_style can be set to ENT_COMPAT to encode " to
 935   * &quot;, or ENT_QUOTES to do both. Default is ENT_NOQUOTES where no quotes are encoded.
 936   *
 937   * @since 1.2.2
 938   * @access private
 939   *
 940   * @staticvar string $_charset
 941   *
 942   * @param string       $string        The text which is to be encoded.
 943   * @param int|string   $quote_style   Optional. Converts double quotes if set to ENT_COMPAT,
 944   *                                    both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES.
 945   *                                    Also compatible with old values; converting single quotes if set to 'single',
 946   *                                    double if set to 'double' or both if otherwise set.
 947   *                                    Default is ENT_NOQUOTES.
 948   * @param false|string $charset       Optional. The character encoding of the string. Default is false.
 949   * @param bool         $double_encode Optional. Whether to encode existing html entities. Default is false.
 950   * @return string The encoded text with HTML entities.
 951   */
 952  function _wp_specialchars( $string, $quote_style = ENT_NOQUOTES, $charset = false, $double_encode = false ) {
 953      $string = (string) $string;
 954  
 955      if ( 0 === strlen( $string ) ) {
 956          return '';
 957      }
 958  
 959      // Don't bother if there are no specialchars - saves some processing
 960      if ( ! preg_match( '/[&<>"\']/', $string ) ) {
 961          return $string;
 962      }
 963  
 964      // Account for the previous behaviour of the function when the $quote_style is not an accepted value
 965      if ( empty( $quote_style ) ) {
 966          $quote_style = ENT_NOQUOTES;
 967      } elseif ( ! in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) ) {
 968          $quote_style = ENT_QUOTES;
 969      }
 970  
 971      // Store the site charset as a static to avoid multiple calls to wp_load_alloptions()
 972      if ( ! $charset ) {
 973          static $_charset = null;
 974          if ( ! isset( $_charset ) ) {
 975              $alloptions = wp_load_alloptions();
 976              $_charset   = isset( $alloptions['blog_charset'] ) ? $alloptions['blog_charset'] : '';
 977          }
 978          $charset = $_charset;
 979      }
 980  
 981      if ( in_array( $charset, array( 'utf8', 'utf-8', 'UTF8' ) ) ) {
 982          $charset = 'UTF-8';
 983      }
 984  
 985      $_quote_style = $quote_style;
 986  
 987      if ( $quote_style === 'double' ) {
 988          $quote_style  = ENT_COMPAT;
 989          $_quote_style = ENT_COMPAT;
 990      } elseif ( $quote_style === 'single' ) {
 991          $quote_style = ENT_NOQUOTES;
 992      }
 993  
 994      if ( ! $double_encode ) {
 995          // Guarantee every &entity; is valid, convert &garbage; into &amp;garbage;
 996          // This is required for PHP < 5.4.0 because ENT_HTML401 flag is unavailable.
 997          $string = wp_kses_normalize_entities( $string );
 998      }
 999  
1000      $string = htmlspecialchars( $string, $quote_style, $charset, $double_encode );
1001  
1002      // Back-compat.
1003      if ( 'single' === $_quote_style ) {
1004          $string = str_replace( "'", '&#039;', $string );
1005      }
1006  
1007      return $string;
1008  }
1009  
1010  /**
1011   * Converts a number of HTML entities into their special characters.
1012   *
1013   * Specifically deals with: &, <, >, ", and '.
1014   *
1015   * $quote_style can be set to ENT_COMPAT to decode " entities,
1016   * or ENT_QUOTES to do both " and '. Default is ENT_NOQUOTES where no quotes are decoded.
1017   *
1018   * @since 2.8.0
1019   *
1020   * @param string     $string The text which is to be decoded.
1021   * @param string|int $quote_style Optional. Converts double quotes if set to ENT_COMPAT,
1022   *                                both single and double if set to ENT_QUOTES or
1023   *                                none if set to ENT_NOQUOTES.
1024   *                                Also compatible with old _wp_specialchars() values;
1025   *                                converting single quotes if set to 'single',
1026   *                                double if set to 'double' or both if otherwise set.
1027   *                                Default is ENT_NOQUOTES.
1028   * @return string The decoded text without HTML entities.
1029   */
1030  function wp_specialchars_decode( $string, $quote_style = ENT_NOQUOTES ) {
1031      $string = (string) $string;
1032  
1033      if ( 0 === strlen( $string ) ) {
1034          return '';
1035      }
1036  
1037      // Don't bother if there are no entities - saves a lot of processing
1038      if ( strpos( $string, '&' ) === false ) {
1039          return $string;
1040      }
1041  
1042      // Match the previous behaviour of _wp_specialchars() when the $quote_style is not an accepted value
1043      if ( empty( $quote_style ) ) {
1044          $quote_style = ENT_NOQUOTES;
1045      } elseif ( ! in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) ) {
1046          $quote_style = ENT_QUOTES;
1047      }
1048  
1049      // More complete than get_html_translation_table( HTML_SPECIALCHARS )
1050      $single      = array(
1051          '&#039;' => '\'',
1052          '&#x27;' => '\'',
1053      );
1054      $single_preg = array(
1055          '/&#0*39;/'   => '&#039;',
1056          '/&#x0*27;/i' => '&#x27;',
1057      );
1058      $double      = array(
1059          '&quot;' => '"',
1060          '&#034;' => '"',
1061          '&#x22;' => '"',
1062      );
1063      $double_preg = array(
1064          '/&#0*34;/'   => '&#034;',
1065          '/&#x0*22;/i' => '&#x22;',
1066      );
1067      $others      = array(
1068          '&lt;'   => '<',
1069          '&#060;' => '<',
1070          '&gt;'   => '>',
1071          '&#062;' => '>',
1072          '&amp;'  => '&',
1073          '&#038;' => '&',
1074          '&#x26;' => '&',
1075      );
1076      $others_preg = array(
1077          '/&#0*60;/'   => '&#060;',
1078          '/&#0*62;/'   => '&#062;',
1079          '/&#0*38;/'   => '&#038;',
1080          '/&#x0*26;/i' => '&#x26;',
1081      );
1082  
1083      if ( $quote_style === ENT_QUOTES ) {
1084          $translation      = array_merge( $single, $double, $others );
1085          $translation_preg = array_merge( $single_preg, $double_preg, $others_preg );
1086      } elseif ( $quote_style === ENT_COMPAT || $quote_style === 'double' ) {
1087          $translation      = array_merge( $double, $others );
1088          $translation_preg = array_merge( $double_preg, $others_preg );
1089      } elseif ( $quote_style === 'single' ) {
1090          $translation      = array_merge( $single, $others );
1091          $translation_preg = array_merge( $single_preg, $others_preg );
1092      } elseif ( $quote_style === ENT_NOQUOTES ) {
1093          $translation      = $others;
1094          $translation_preg = $others_preg;
1095      }
1096  
1097      // Remove zero padding on numeric entities
1098      $string = preg_replace( array_keys( $translation_preg ), array_values( $translation_preg ), $string );
1099  
1100      // Replace characters according to translation table
1101      return strtr( $string, $translation );
1102  }
1103  
1104  /**
1105   * Checks for invalid UTF8 in a string.
1106   *
1107   * @since 2.8.0
1108   *
1109   * @staticvar bool $is_utf8
1110   * @staticvar bool $utf8_pcre
1111   *
1112   * @param string  $string The text which is to be checked.
1113   * @param bool    $strip Optional. Whether to attempt to strip out invalid UTF8. Default is false.
1114   * @return string The checked text.
1115   */
1116  function wp_check_invalid_utf8( $string, $strip = false ) {
1117      $string = (string) $string;
1118  
1119      if ( 0 === strlen( $string ) ) {
1120          return '';
1121      }
1122  
1123      // Store the site charset as a static to avoid multiple calls to get_option()
1124      static $is_utf8 = null;
1125      if ( ! isset( $is_utf8 ) ) {
1126          $is_utf8 = in_array( get_option( 'blog_charset' ), array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) );
1127      }
1128      if ( ! $is_utf8 ) {
1129          return $string;
1130      }
1131  
1132      // Check for support for utf8 in the installed PCRE library once and store the result in a static
1133      static $utf8_pcre = null;
1134      if ( ! isset( $utf8_pcre ) ) {
1135          // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
1136          $utf8_pcre = @preg_match( '/^./u', 'a' );
1137      }
1138      // We can't demand utf8 in the PCRE installation, so just return the string in those cases
1139      if ( ! $utf8_pcre ) {
1140          return $string;
1141      }
1142  
1143      // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- preg_match fails when it encounters invalid UTF8 in $string
1144      if ( 1 === @preg_match( '/^./us', $string ) ) {
1145          return $string;
1146      }
1147  
1148      // Attempt to strip the bad chars if requested (not recommended)
1149      if ( $strip && function_exists( 'iconv' ) ) {
1150          return iconv( 'utf-8', 'utf-8', $string );
1151      }
1152  
1153      return '';
1154  }
1155  
1156  /**
1157   * Encode the Unicode values to be used in the URI.
1158   *
1159   * @since 1.5.0
1160   *
1161   * @param string $utf8_string
1162   * @param int    $length Max  length of the string
1163   * @return string String with Unicode encoded for URI.
1164   */
1165  function utf8_uri_encode( $utf8_string, $length = 0 ) {
1166      $unicode        = '';
1167      $values         = array();
1168      $num_octets     = 1;
1169      $unicode_length = 0;
1170  
1171      mbstring_binary_safe_encoding();
1172      $string_length = strlen( $utf8_string );
1173      reset_mbstring_encoding();
1174  
1175      for ( $i = 0; $i < $string_length; $i++ ) {
1176  
1177          $value = ord( $utf8_string[ $i ] );
1178  
1179          if ( $value < 128 ) {
1180              if ( $length && ( $unicode_length >= $length ) ) {
1181                  break;
1182              }
1183              $unicode .= chr( $value );
1184              $unicode_length++;
1185          } else {
1186              if ( count( $values ) == 0 ) {
1187                  if ( $value < 224 ) {
1188                      $num_octets = 2;
1189                  } elseif ( $value < 240 ) {
1190                      $num_octets = 3;
1191                  } else {
1192                      $num_octets = 4;
1193                  }
1194              }
1195  
1196              $values[] = $value;
1197  
1198              if ( $length && ( $unicode_length + ( $num_octets * 3 ) ) > $length ) {
1199                  break;
1200              }
1201              if ( count( $values ) == $num_octets ) {
1202                  for ( $j = 0; $j < $num_octets; $j++ ) {
1203                      $unicode .= '%' . dechex( $values[ $j ] );
1204                  }
1205  
1206                  $unicode_length += $num_octets * 3;
1207  
1208                  $values     = array();
1209                  $num_octets = 1;
1210              }
1211          }
1212      }
1213  
1214      return $unicode;
1215  }
1216  
1217  /**
1218   * Converts all accent characters to ASCII characters.
1219   *
1220   * If there are no accent characters, then the string given is just returned.
1221   *
1222   * **Accent characters converted:**
1223   *
1224   * Currency signs:
1225   *
1226   * |   Code   | Glyph | Replacement |     Description     |
1227   * | -------- | ----- | ----------- | ------------------- |
1228   * | U+00A3   | £     | (empty)     | British Pound sign  |
1229   * | U+20AC   | €     | E           | Euro sign           |
1230   *
1231   * Decompositions for Latin-1 Supplement:
1232   *
1233   * |  Code   | Glyph | Replacement |               Description              |
1234   * | ------- | ----- | ----------- | -------------------------------------- |
1235   * | U+00AA  | ª     | a           | Feminine ordinal indicator             |
1236   * | U+00BA  | º     | o           | Masculine ordinal indicator            |
1237   * | U+00C0  | À     | A           | Latin capital letter A with grave      |
1238   * | U+00C1  | Á     | A           | Latin capital letter A with acute      |
1239   * | U+00C2  | Â     | A           | Latin capital letter A with circumflex |
1240   * | U+00C3  | Ã     | A           | Latin capital letter A with tilde      |
1241   * | U+00C4  | Ä     | A           | Latin capital letter A with diaeresis  |
1242   * | U+00C5  | Å     | A           | Latin capital letter A with ring above |
1243   * | U+00C6  | Æ     | AE          | Latin capital letter AE                |
1244   * | U+00C7  | Ç     | C           | Latin capital letter C with cedilla    |
1245   * | U+00C8  | È     | E           | Latin capital letter E with grave      |
1246   * | U+00C9  | É     | E           | Latin capital letter E with acute      |
1247   * | U+00CA  | Ê     | E           | Latin capital letter E with circumflex |
1248   * | U+00CB  | Ë     | E           | Latin capital letter E with diaeresis  |
1249   * | U+00CC  | Ì     | I           | Latin capital letter I with grave      |
1250   * | U+00CD  | Í     | I           | Latin capital letter I with acute      |
1251   * | U+00CE  | Î     | I           | Latin capital letter I with circumflex |
1252   * | U+00CF  | Ï     | I           | Latin capital letter I with diaeresis  |
1253   * | U+00D0  | Ð     | D           | Latin capital letter Eth               |
1254   * | U+00D1  | Ñ     | N           | Latin capital letter N with tilde      |
1255   * | U+00D2  | Ò     | O           | Latin capital letter O with grave      |
1256   * | U+00D3  | Ó     | O           | Latin capital letter O with acute      |
1257   * | U+00D4  | Ô     | O           | Latin capital letter O with circumflex |
1258   * | U+00D5  | Õ     | O           | Latin capital letter O with tilde      |
1259   * | U+00D6  | Ö     | O           | Latin capital letter O with diaeresis  |
1260   * | U+00D8  | Ø     | O           | Latin capital letter O with stroke     |
1261   * | U+00D9  | Ù     | U           | Latin capital letter U with grave      |
1262   * | U+00DA  | Ú     | U           | Latin capital letter U with acute      |
1263   * | U+00DB  | Û     | U           | Latin capital letter U with circumflex |
1264   * | U+00DC  | Ü     | U           | Latin capital letter U with diaeresis  |
1265   * | U+00DD  | Ý     | Y           | Latin capital letter Y with acute      |
1266   * | U+00DE  | Þ     | TH          | Latin capital letter Thorn             |
1267   * | U+00DF  | ß     | s           | Latin small letter sharp s             |
1268   * | U+00E0  | à     | a           | Latin small letter a with grave        |
1269   * | U+00E1  | á     | a           | Latin small letter a with acute        |
1270   * | U+00E2  | â     | a           | Latin small letter a with circumflex   |
1271   * | U+00E3  | ã     | a           | Latin small letter a with tilde        |
1272   * | U+00E4  | ä     | a           | Latin small letter a with diaeresis    |
1273   * | U+00E5  | å     | a           | Latin small letter a with ring above   |
1274   * | U+00E6  | æ     | ae          | Latin small letter ae                  |
1275   * | U+00E7  | ç     | c           | Latin small letter c with cedilla      |
1276   * | U+00E8  | è     | e           | Latin small letter e with grave        |
1277   * | U+00E9  | é     | e           | Latin small letter e with acute        |
1278   * | U+00EA  | ê     | e           | Latin small letter e with circumflex   |
1279   * | U+00EB  | ë     | e           | Latin small letter e with diaeresis    |
1280   * | U+00EC  | ì     | i           | Latin small letter i with grave        |
1281   * | U+00ED  | í     | i           | Latin small letter i with acute        |
1282   * | U+00EE  | î     | i           | Latin small letter i with circumflex   |
1283   * | U+00EF  | ï     | i           | Latin small letter i with diaeresis    |
1284   * | U+00F0  | ð     | d           | Latin small letter Eth                 |
1285   * | U+00F1  | ñ     | n           | Latin small letter n with tilde        |
1286   * | U+00F2  | ò     | o           | Latin small letter o with grave        |
1287   * | U+00F3  | ó     | o           | Latin small letter o with acute        |
1288   * | U+00F4  | ô     | o           | Latin small letter o with circumflex   |
1289   * | U+00F5  | õ     | o           | Latin small letter o with tilde        |
1290   * | U+00F6  | ö     | o           | Latin small letter o with diaeresis    |
1291   * | U+00F8  | ø     | o           | Latin small letter o with stroke       |
1292   * | U+00F9  | ù     | u           | Latin small letter u with grave        |
1293   * | U+00FA  | ú     | u           | Latin small letter u with acute        |
1294   * | U+00FB  | û     | u           | Latin small letter u with circumflex   |
1295   * | U+00FC  | ü     | u           | Latin small letter u with diaeresis    |
1296   * | U+00FD  | ý     | y           | Latin small letter y with acute        |
1297   * | U+00FE  | þ     | th          | Latin small letter Thorn               |
1298   * | U+00FF  | ÿ     | y           | Latin small letter y with diaeresis    |
1299   *
1300   * Decompositions for Latin Extended-A:
1301   *
1302   * |  Code   | Glyph | Replacement |                    Description                    |
1303   * | ------- | ----- | ----------- | ------------------------------------------------- |
1304   * | U+0100  | Ā     | A           | Latin capital letter A with macron                |
1305   * | U+0101  | ā     | a           | Latin small letter a with macron                  |
1306   * | U+0102  | Ă     | A           | Latin capital letter A with breve                 |
1307   * | U+0103  | ă     | a           | Latin small letter a with breve                   |
1308   * | U+0104  | Ą     | A           | Latin capital letter A with ogonek                |
1309   * | U+0105  | ą     | a           | Latin small letter a with ogonek                  |
1310   * | U+01006 | Ć     | C           | Latin capital letter C with acute                 |
1311   * | U+0107  | ć     | c           | Latin small letter c with acute                   |
1312   * | U+0108  | Ĉ     | C           | Latin capital letter C with circumflex            |
1313   * | U+0109  | ĉ     | c           | Latin small letter c with circumflex              |
1314   * | U+010A  | Ċ     | C           | Latin capital letter C with dot above             |
1315   * | U+010B  | ċ     | c           | Latin small letter c with dot above               |
1316   * | U+010C  | Č     | C           | Latin capital letter C with caron                 |
1317   * | U+010D  | č     | c           | Latin small letter c with caron                   |
1318   * | U+010E  | Ď     | D           | Latin capital letter D with caron                 |
1319   * | U+010F  | ď     | d           | Latin small letter d with caron                   |
1320   * | U+0110  | Đ     | D           | Latin capital letter D with stroke                |
1321   * | U+0111  | đ     | d           | Latin small letter d with stroke                  |
1322   * | U+0112  | Ē     | E           | Latin capital letter E with macron                |
1323   * | U+0113  | ē     | e           | Latin small letter e with macron                  |
1324   * | U+0114  | Ĕ     | E           | Latin capital letter E with breve                 |
1325   * | U+0115  | ĕ     | e           | Latin small letter e with breve                   |
1326   * | U+0116  | Ė     | E           | Latin capital letter E with dot above             |
1327   * | U+0117  | ė     | e           | Latin small letter e with dot above               |
1328   * | U+0118  | Ę     | E           | Latin capital letter E with ogonek                |
1329   * | U+0119  | ę     | e           | Latin small letter e with ogonek                  |
1330   * | U+011A  | Ě     | E           | Latin capital letter E with caron                 |
1331   * | U+011B  | ě     | e           | Latin small letter e with caron                   |
1332   * | U+011C  | Ĝ     | G           | Latin capital letter G with circumflex            |
1333   * | U+011D  | ĝ     | g           | Latin small letter g with circumflex              |
1334   * | U+011E  | Ğ     | G           | Latin capital letter G with breve                 |
1335   * | U+011F  | ğ     | g           | Latin small letter g with breve                   |
1336   * | U+0120  | Ġ     | G           | Latin capital letter G with dot above             |
1337   * | U+0121  | ġ     | g           | Latin small letter g with dot above               |
1338   * | U+0122  | Ģ     | G           | Latin capital letter G with cedilla               |
1339   * | U+0123  | ģ     | g           | Latin small letter g with cedilla                 |
1340   * | U+0124  | Ĥ     | H           | Latin capital letter H with circumflex            |
1341   * | U+0125  | ĥ     | h           | Latin small letter h with circumflex              |
1342   * | U+0126  | Ħ     | H           | Latin capital letter H with stroke                |
1343   * | U+0127  | ħ     | h           | Latin small letter h with stroke                  |
1344   * | U+0128  | Ĩ     | I           | Latin capital letter I with tilde                 |
1345   * | U+0129  | ĩ     | i           | Latin small letter i with tilde                   |
1346   * | U+012A  | Ī     | I           | Latin capital letter I with macron                |
1347   * | U+012B  | ī     | i           | Latin small letter i with macron                  |
1348   * | U+012C  | Ĭ     | I           | Latin capital letter I with breve                 |
1349   * | U+012D  | ĭ     | i           | Latin small letter i with breve                   |
1350   * | U+012E  | Į     | I           | Latin capital letter I with ogonek                |
1351   * | U+012F  | į     | i           | Latin small letter i with ogonek                  |
1352   * | U+0130  | İ     | I           | Latin capital letter I with dot above             |
1353   * | U+0131  | ı     | i           | Latin small letter dotless i                      |
1354   * | U+0132  | IJ     | IJ          | Latin capital ligature IJ                         |
1355   * | U+0133  | ij     | ij          | Latin small ligature ij                           |
1356   * | U+0134  | Ĵ     | J           | Latin capital letter J with circumflex            |
1357   * | U+0135  | ĵ     | j           | Latin small letter j with circumflex              |
1358   * | U+0136  | Ķ     | K           | Latin capital letter K with cedilla               |
1359   * | U+0137  | ķ     | k           | Latin small letter k with cedilla                 |
1360   * | U+0138  | ĸ     | k           | Latin small letter Kra                            |
1361   * | U+0139  | Ĺ     | L           | Latin capital letter L with acute                 |
1362   * | U+013A  | ĺ     | l           | Latin small letter l with acute                   |
1363   * | U+013B  | Ļ     | L           | Latin capital letter L with cedilla               |
1364   * | U+013C  | ļ     | l           | Latin small letter l with cedilla                 |
1365   * | U+013D  | Ľ     | L           | Latin capital letter L with caron                 |
1366   * | U+013E  | ľ     | l           | Latin small letter l with caron                   |
1367   * | U+013F  | Ŀ     | L           | Latin capital letter L with middle dot            |
1368   * | U+0140  | ŀ     | l           | Latin small letter l with middle dot              |
1369   * | U+0141  | Ł     | L           | Latin capital letter L with stroke                |
1370   * | U+0142  | ł     | l           | Latin small letter l with stroke                  |
1371   * | U+0143  | Ń     | N           | Latin capital letter N with acute                 |
1372   * | U+0144  | ń     | n           | Latin small letter N with acute                   |
1373   * | U+0145  | Ņ     | N           | Latin capital letter N with cedilla               |
1374   * | U+0146  | ņ     | n           | Latin small letter n with cedilla                 |
1375   * | U+0147  | Ň     | N           | Latin capital letter N with caron                 |
1376   * | U+0148  | ň     | n           | Latin small letter n with caron                   |
1377   * | U+0149  | ʼn     | n           | Latin small letter n preceded by apostrophe       |
1378   * | U+014A  | Ŋ     | N           | Latin capital letter Eng                          |
1379   * | U+014B  | ŋ     | n           | Latin small letter Eng                            |
1380   * | U+014C  | Ō     | O           | Latin capital letter O with macron                |
1381   * | U+014D  | ō     | o           | Latin small letter o with macron                  |
1382   * | U+014E  | Ŏ     | O           | Latin capital letter O with breve                 |
1383   * | U+014F  | ŏ     | o           | Latin small letter o with breve                   |
1384   * | U+0150  | Ő     | O           | Latin capital letter O with double acute          |
1385   * | U+0151  | ő     | o           | Latin small letter o with double acute            |
1386   * | U+0152  | Π    | OE          | Latin capital ligature OE                         |
1387   * | U+0153  | œ     | oe          | Latin small ligature oe                           |
1388   * | U+0154  | Ŕ     | R           | Latin capital letter R with acute                 |
1389   * | U+0155  | ŕ     | r           | Latin small letter r with acute                   |
1390   * | U+0156  | Ŗ     | R           | Latin capital letter R with cedilla               |
1391   * | U+0157  | ŗ     | r           | Latin small letter r with cedilla                 |
1392   * | U+0158  | Ř     | R           | Latin capital letter R with caron                 |
1393   * | U+0159  | ř     | r           | Latin small letter r with caron                   |
1394   * | U+015A  | Ś     | S           | Latin capital letter S with acute                 |
1395   * | U+015B  | ś     | s           | Latin small letter s with acute                   |
1396   * | U+015C  | Ŝ     | S           | Latin capital letter S with circumflex            |
1397   * | U+015D  | ŝ     | s           | Latin small letter s with circumflex              |
1398   * | U+015E  | Ş     | S           | Latin capital letter S with cedilla               |
1399   * | U+015F  | ş     | s           | Latin small letter s with cedilla                 |
1400   * | U+0160  | Š     | S           | Latin capital letter S with caron                 |
1401   * | U+0161  | š     | s           | Latin small letter s with caron                   |
1402   * | U+0162  | Ţ     | T           | Latin capital letter T with cedilla               |
1403   * | U+0163  | ţ     | t           | Latin small letter t with cedilla                 |
1404   * | U+0164  | Ť     | T           | Latin capital letter T with caron                 |
1405   * | U+0165  | ť     | t           | Latin small letter t with caron                   |
1406   * | U+0166  | Ŧ     | T           | Latin capital letter T with stroke                |
1407   * | U+0167  | ŧ     | t           | Latin small letter t with stroke                  |
1408   * | U+0168  | Ũ     | U           | Latin capital letter U with tilde                 |
1409   * | U+0169  | ũ     | u           | Latin small letter u with tilde                   |
1410   * | U+016A  | Ū     | U           | Latin capital letter U with macron                |
1411   * | U+016B  | ū     | u           | Latin small letter u with macron                  |
1412   * | U+016C  | Ŭ     | U           | Latin capital letter U with breve                 |
1413   * | U+016D  | ŭ     | u           | Latin small letter u with breve                   |
1414   * | U+016E  | Ů     | U           | Latin capital letter U with ring above            |
1415   * | U+016F  | ů     | u           | Latin small letter u with ring above              |
1416   * | U+0170  | Ű     | U           | Latin capital letter U with double acute          |
1417   * | U+0171  | ű     | u           | Latin small letter u with double acute            |
1418   * | U+0172  | Ų     | U           | Latin capital letter U with ogonek                |
1419   * | U+0173  | ų     | u           | Latin small letter u with ogonek                  |
1420   * | U+0174  | Ŵ     | W           | Latin capital letter W with circumflex            |
1421   * | U+0175  | ŵ     | w           | Latin small letter w with circumflex              |
1422   * | U+0176  | Ŷ     | Y           | Latin capital letter Y with circumflex            |
1423   * | U+0177  | ŷ     | y           | Latin small letter y with circumflex              |
1424   * | U+0178  | Ÿ     | Y           | Latin capital letter Y with diaeresis             |
1425   * | U+0179  | Ź     | Z           | Latin capital letter Z with acute                 |
1426   * | U+017A  | ź     | z           | Latin small letter z with acute                   |
1427   * | U+017B  | Ż     | Z           | Latin capital letter Z with dot above             |
1428   * | U+017C  | ż     | z           | Latin small letter z with dot above               |
1429   * | U+017D  | Ž     | Z           | Latin capital letter Z with caron                 |
1430   * | U+017E  | ž     | z           | Latin small letter z with caron                   |
1431   * | U+017F  | ſ     | s           | Latin small letter long s                         |
1432   * | U+01A0  | Ơ     | O           | Latin capital letter O with horn                  |
1433   * | U+01A1  | ơ     | o           | Latin small letter o with horn                    |
1434   * | U+01AF  | Ư     | U           | Latin capital letter U with horn                  |
1435   * | U+01B0  | ư     | u           | Latin small letter u with horn                    |
1436   * | U+01CD  | Ǎ     | A           | Latin capital letter A with caron                 |
1437   * | U+01CE  | ǎ     | a           | Latin small letter a with caron                   |
1438   * | U+01CF  | Ǐ     | I           | Latin capital letter I with caron                 |
1439   * | U+01D0  | ǐ     | i           | Latin small letter i with caron                   |
1440   * | U+01D1  | Ǒ     | O           | Latin capital letter O with caron                 |
1441   * | U+01D2  | ǒ     | o           | Latin small letter o with caron                   |
1442   * | U+01D3  | Ǔ     | U           | Latin capital letter U with caron                 |
1443   * | U+01D4  | ǔ     | u           | Latin small letter u with caron                   |
1444   * | U+01D5  | Ǖ     | U           | Latin capital letter U with diaeresis and macron  |
1445   * | U+01D6  | ǖ     | u           | Latin small letter u with diaeresis and macron    |
1446   * | U+01D7  | Ǘ     | U           | Latin capital letter U with diaeresis and acute   |
1447   * | U+01D8  | ǘ     | u           | Latin small letter u with diaeresis and acute     |
1448   * | U+01D9  | Ǚ     | U           | Latin capital letter U with diaeresis and caron   |
1449   * | U+01DA  | ǚ     | u           | Latin small letter u with diaeresis and caron     |
1450   * | U+01DB  | Ǜ     | U           | Latin capital letter U with diaeresis and grave   |
1451   * | U+01DC  | ǜ     | u           | Latin small letter u with diaeresis and grave     |
1452   *
1453   * Decompositions for Latin Extended-B:
1454   *
1455   * |   Code   | Glyph | Replacement |                Description                |
1456   * | -------- | ----- | ----------- | ----------------------------------------- |
1457   * | U+0218   | Ș     | S           | Latin capital letter S with comma below   |
1458   * | U+0219   | ș     | s           | Latin small letter s with comma below     |
1459   * | U+021A   | Ț     | T           | Latin capital letter T with comma below   |
1460   * | U+021B   | ț     | t           | Latin small letter t with comma below     |
1461   *
1462   * Vowels with diacritic (Chinese, Hanyu Pinyin):
1463   *
1464   * |   Code   | Glyph | Replacement |                      Description                      |
1465   * | -------- | ----- | ----------- | ----------------------------------------------------- |
1466   * | U+0251   | ɑ     | a           | Latin small letter alpha                              |
1467   * | U+1EA0   | Ạ     | A           | Latin capital letter A with dot below                 |
1468   * | U+1EA1   | ạ     | a           | Latin small letter a with dot below                   |
1469   * | U+1EA2   | Ả     | A           | Latin capital letter A with hook above                |
1470   * | U+1EA3   | ả     | a           | Latin small letter a with hook above                  |
1471   * | U+1EA4   | Ấ     | A           | Latin capital letter A with circumflex and acute      |
1472   * | U+1EA5   | ấ     | a           | Latin small letter a with circumflex and acute        |
1473   * | U+1EA6   | Ầ     | A           | Latin capital letter A with circumflex and grave      |
1474   * | U+1EA7   | ầ     | a           | Latin small letter a with circumflex and grave        |
1475   * | U+1EA8   | Ẩ     | A           | Latin capital letter A with circumflex and hook above |
1476   * | U+1EA9   | ẩ     | a           | Latin small letter a with circumflex and hook above   |
1477   * | U+1EAA   | Ẫ     | A           | Latin capital letter A with circumflex and tilde      |
1478   * | U+1EAB   | ẫ     | a           | Latin small letter a with circumflex and tilde        |
1479   * | U+1EA6   | Ậ     | A           | Latin capital letter A with circumflex and dot below  |
1480   * | U+1EAD   | ậ     | a           | Latin small letter a with circumflex and dot below    |
1481   * | U+1EAE   | Ắ     | A           | Latin capital letter A with breve and acute           |
1482   * | U+1EAF   | ắ     | a           | Latin small letter a with breve and acute             |
1483   * | U+1EB0   | Ằ     | A           | Latin capital letter A with breve and grave           |
1484   * | U+1EB1   | ằ     | a           | Latin small letter a with breve and grave             |
1485   * | U+1EB2   | Ẳ     | A           | Latin capital letter A with breve and hook above      |
1486   * | U+1EB3   | ẳ     | a           | Latin small letter a with breve and hook above        |
1487   * | U+1EB4   | Ẵ     | A           | Latin capital letter A with breve and tilde           |
1488   * | U+1EB5   | ẵ     | a           | Latin small letter a with breve and tilde             |
1489   * | U+1EB6   | Ặ     | A           | Latin capital letter A with breve and dot below       |
1490   * | U+1EB7   | ặ     | a           | Latin small letter a with breve and dot below         |
1491   * | U+1EB8   | Ẹ     | E           | Latin capital letter E with dot below                 |
1492   * | U+1EB9   | ẹ     | e           | Latin small letter e with dot below                   |
1493   * | U+1EBA   | Ẻ     | E           | Latin capital letter E with hook above                |
1494   * | U+1EBB   | ẻ     | e           | Latin small letter e with hook above                  |
1495   * | U+1EBC   | Ẽ     | E           | Latin capital letter E with tilde                     |
1496   * | U+1EBD   | ẽ     | e           | Latin small letter e with tilde                       |
1497   * | U+1EBE   | Ế     | E           | Latin capital letter E with circumflex and acute      |
1498   * | U+1EBF   | ế     | e           | Latin small letter e with circumflex and acute        |
1499   * | U+1EC0   | Ề     | E           | Latin capital letter E with circumflex and grave      |
1500   * | U+1EC1   | ề     | e           | Latin small letter e with circumflex and grave        |
1501   * | U+1EC2   | Ể     | E           | Latin capital letter E with circumflex and hook above |
1502   * | U+1EC3   | ể     | e           | Latin small letter e with circumflex and hook above   |
1503   * | U+1EC4   | Ễ     | E           | Latin capital letter E with circumflex and tilde      |
1504   * | U+1EC5   | ễ     | e           | Latin small letter e with circumflex and tilde        |
1505   * | U+1EC6   | Ệ     | E           | Latin capital letter E with circumflex and dot below  |
1506   * | U+1EC7   | ệ     | e           | Latin small letter e with circumflex and dot below    |
1507   * | U+1EC8   | Ỉ     | I           | Latin capital letter I with hook above                |
1508   * | U+1EC9   | ỉ     | i           | Latin small letter i with hook above                  |
1509   * | U+1ECA   | Ị     | I           | Latin capital letter I with dot below                 |
1510   * | U+1ECB   | ị     | i           | Latin small letter i with dot below                   |
1511   * | U+1ECC   | Ọ     | O           | Latin capital letter O with dot below                 |
1512   * | U+1ECD   | ọ     | o           | Latin small letter o with dot below                   |
1513   * | U+1ECE   | Ỏ     | O           | Latin capital letter O with hook above                |
1514   * | U+1ECF   | ỏ     | o           | Latin small letter o with hook above                  |
1515   * | U+1ED0   | Ố     | O           | Latin capital letter O with circumflex and acute      |
1516   * | U+1ED1   | ố     | o           | Latin small letter o with circumflex and acute        |
1517   * | U+1ED2   | Ồ     | O           | Latin capital letter O with circumflex and grave      |
1518   * | U+1ED3   | ồ     | o           | Latin small letter o with circumflex and grave        |
1519   * | U+1ED4   | Ổ     | O           | Latin capital letter O with circumflex and hook above |
1520   * | U+1ED5   | ổ     | o           | Latin small letter o with circumflex and hook above   |
1521   * | U+1ED6   | Ỗ     | O           | Latin capital letter O with circumflex and tilde      |
1522   * | U+1ED7   | ỗ     | o           | Latin small letter o with circumflex and tilde        |
1523   * | U+1ED8   | Ộ     | O           | Latin capital letter O with circumflex and dot below  |
1524   * | U+1ED9   | ộ     | o           | Latin small letter o with circumflex and dot below    |
1525   * | U+1EDA   | Ớ     | O           | Latin capital letter O with horn and acute            |
1526   * | U+1EDB   | ớ     | o           | Latin small letter o with horn and acute              |
1527   * | U+1EDC   | Ờ     | O           | Latin capital letter O with horn and grave            |
1528   * | U+1EDD   | ờ     | o           | Latin small letter o with horn and grave              |
1529   * | U+1EDE   | Ở     | O           | Latin capital letter O with horn and hook above       |
1530   * | U+1EDF   | ở     | o           | Latin small letter o with horn and hook above         |
1531   * | U+1EE0   | Ỡ     | O           | Latin capital letter O with horn and tilde            |
1532   * | U+1EE1   | ỡ     | o           | Latin small letter o with horn and tilde              |
1533   * | U+1EE2   | Ợ     | O           | Latin capital letter O with horn and dot below        |
1534   * | U+1EE3   | ợ     | o           | Latin small letter o with horn and dot below          |
1535   * | U+1EE4   | Ụ     | U           | Latin capital letter U with dot below                 |
1536   * | U+1EE5   | ụ     | u           | Latin small letter u with dot below                   |
1537   * | U+1EE6   | Ủ     | U           | Latin capital letter U with hook above                |
1538   * | U+1EE7   | ủ     | u           | Latin small letter u with hook above                  |
1539   * | U+1EE8   | Ứ     | U           | Latin capital letter U with horn and acute            |
1540   * | U+1EE9   | ứ     | u           | Latin small letter u with horn and acute              |
1541   * | U+1EEA   | Ừ     | U           | Latin capital letter U with horn and grave            |
1542   * | U+1EEB   | ừ     | u           | Latin small letter u with horn and grave              |
1543   * | U+1EEC   | Ử     | U           | Latin capital letter U with horn and hook above       |
1544   * | U+1EED   | ử     | u           | Latin small letter u with horn and hook above         |
1545   * | U+1EEE   | Ữ     | U           | Latin capital letter U with horn and tilde            |
1546   * | U+1EEF   | ữ     | u           | Latin small letter u with horn and tilde              |
1547   * | U+1EF0   | Ự     | U           | Latin capital letter U with horn and dot below        |
1548   * | U+1EF1   | ự     | u           | Latin small letter u with horn and dot below          |
1549   * | U+1EF2   | Ỳ     | Y           | Latin capital letter Y with grave                     |
1550   * | U+1EF3   | ỳ     | y           | Latin small letter y with grave                       |
1551   * | U+1EF4   | Ỵ     | Y           | Latin capital letter Y with dot below                 |
1552   * | U+1EF5   | ỵ     | y           | Latin small letter y with dot below                   |
1553   * | U+1EF6   | Ỷ     | Y           | Latin capital letter Y with hook above                |
1554   * | U+1EF7   | ỷ     | y           | Latin small letter y with hook above                  |
1555   * | U+1EF8   | Ỹ     | Y           | Latin capital letter Y with tilde                     |
1556   * | U+1EF9   | ỹ     | y           | Latin small letter y with tilde                       |
1557   *
1558   * German (`de_DE`), German formal (`de_DE_formal`), German (Switzerland) formal (`de_CH`),
1559   * and German (Switzerland) informal (`de_CH_informal`) locales:
1560   *
1561   * |   Code   | Glyph | Replacement |               Description               |
1562   * | -------- | ----- | ----------- | --------------------------------------- |
1563   * | U+00C4   | Ä     | Ae          | Latin capital letter A with diaeresis   |
1564   * | U+00E4   | ä     | ae          | Latin small letter a with diaeresis     |
1565   * | U+00D6   | Ö     | Oe          | Latin capital letter O with diaeresis   |
1566   * | U+00F6   | ö     | oe          | Latin small letter o with diaeresis     |
1567   * | U+00DC   | Ü     | Ue          | Latin capital letter U with diaeresis   |
1568   * | U+00FC   | ü     | ue          | Latin small letter u with diaeresis     |
1569   * | U+00DF   | ß     | ss          | Latin small letter sharp s              |
1570   *
1571   * Danish (`da_DK`) locale:
1572   *
1573   * |   Code   | Glyph | Replacement |               Description               |
1574   * | -------- | ----- | ----------- | --------------------------------------- |
1575   * | U+00C6   | Æ     | Ae          | Latin capital letter AE                 |
1576   * | U+00E6   | æ     | ae          | Latin small letter ae                   |
1577   * | U+00D8   | Ø     | Oe          | Latin capital letter O with stroke      |
1578   * | U+00F8   | ø     | oe          | Latin small letter o with stroke        |
1579   * | U+00C5   | Å     | Aa          | Latin capital letter A with ring above  |
1580   * | U+00E5   | å     | aa          | Latin small letter a with ring above    |
1581   *
1582   * Catalan (`ca`) locale:
1583   *
1584   * |   Code   | Glyph | Replacement |               Description               |
1585   * | -------- | ----- | ----------- | --------------------------------------- |
1586   * | U+00B7   | l·l   | ll          | Flown dot (between two Ls)              |
1587   *
1588   * Serbian (`sr_RS`) and Bosnian (`bs_BA`) locales:
1589   *
1590   * |   Code   | Glyph | Replacement |               Description               |
1591   * | -------- | ----- | ----------- | --------------------------------------- |
1592   * | U+0110   | Đ     | DJ          | Latin capital letter D with stroke      |
1593   * | U+0111   | đ     | dj          | Latin small letter d with stroke        |
1594   *
1595   * @since 1.2.1
1596   * @since 4.6.0 Added locale support for `de_CH`, `de_CH_informal`, and `ca`.
1597   * @since 4.7.0 Added locale support for `sr_RS`.
1598   * @since 4.8.0 Added locale support for `bs_BA`.
1599   *
1600   * @param string $string Text that might have accent characters
1601   * @return string Filtered string with replaced "nice" characters.
1602   */
1603  function remove_accents( $string ) {
1604      if ( ! preg_match( '/[\x80-\xff]/', $string ) ) {
1605          return $string;
1606      }
1607  
1608      if ( seems_utf8( $string ) ) {
1609          $chars = array(
1610              // Decompositions for Latin-1 Supplement
1611              'ª' => 'a',
1612              'º' => 'o',
1613              'À' => 'A',
1614              'Á' => 'A',
1615              'Â' => 'A',
1616              'Ã' => 'A',
1617              'Ä' => 'A',
1618              'Å' => 'A',
1619              'Æ' => 'AE',
1620              'Ç' => 'C',
1621              'È' => 'E',
1622              'É' => 'E',
1623              'Ê' => 'E',
1624              'Ë' => 'E',
1625              'Ì' => 'I',
1626              'Í' => 'I',
1627              'Î' => 'I',
1628              'Ï' => 'I',
1629              'Ð' => 'D',
1630              'Ñ' => 'N',
1631              'Ò' => 'O',
1632              'Ó' => 'O',
1633              'Ô' => 'O',
1634              'Õ' => 'O',
1635              'Ö' => 'O',
1636              'Ù' => 'U',
1637              'Ú' => 'U',
1638              'Û' => 'U',
1639              'Ü' => 'U',
1640              'Ý' => 'Y',
1641              'Þ' => 'TH',
1642              'ß' => 's',
1643              'à' => 'a',
1644              'á' => 'a',
1645              'â' => 'a',
1646              'ã' => 'a',
1647              'ä' => 'a',
1648              'å' => 'a',
1649              'æ' => 'ae',
1650              'ç' => 'c',
1651              'è' => 'e',
1652              'é' => 'e',
1653              'ê' => 'e',
1654              'ë' => 'e',
1655              'ì' => 'i',
1656              'í' => 'i',
1657              'î' => 'i',
1658              'ï' => 'i',
1659              'ð' => 'd',
1660              'ñ' => 'n',
1661              'ò' => 'o',
1662              'ó' => 'o',
1663              'ô' => 'o',
1664              'õ' => 'o',
1665              'ö' => 'o',
1666              'ø' => 'o',
1667              'ù' => 'u',
1668              'ú' => 'u',
1669              'û' => 'u',
1670              'ü' => 'u',
1671              'ý' => 'y',
1672              'þ' => 'th',
1673              'ÿ' => 'y',
1674              'Ø' => 'O',
1675              // Decompositions for Latin Extended-A
1676              'Ā' => 'A',
1677              'ā' => 'a',
1678              'Ă' => 'A',
1679              'ă' => 'a',
1680              'Ą' => 'A',
1681              'ą' => 'a',
1682              'Ć' => 'C',
1683              'ć' => 'c',
1684              'Ĉ' => 'C',
1685              'ĉ' => 'c',
1686              'Ċ' => 'C',
1687              'ċ' => 'c',
1688              'Č' => 'C',
1689              'č' => 'c',
1690              'Ď' => 'D',
1691              'ď' => 'd',
1692              'Đ' => 'D',
1693              'đ' => 'd',
1694              'Ē' => 'E',
1695              'ē' => 'e',
1696              'Ĕ' => 'E',
1697              'ĕ' => 'e',
1698              'Ė' => 'E',
1699              'ė' => 'e',
1700              'Ę' => 'E',
1701              'ę' => 'e',
1702              'Ě' => 'E',
1703              'ě' => 'e',
1704              'Ĝ' => 'G',
1705              'ĝ' => 'g',
1706              'Ğ' => 'G',
1707              'ğ' => 'g',
1708              'Ġ' => 'G',
1709              'ġ' => 'g',
1710              'Ģ' => 'G',
1711              'ģ' => 'g',
1712              'Ĥ' => 'H',
1713              'ĥ' => 'h',
1714              'Ħ' => 'H',
1715              'ħ' => 'h',
1716              'Ĩ' => 'I',
1717              'ĩ' => 'i',
1718              'Ī' => 'I',
1719              'ī' => 'i',
1720              'Ĭ' => 'I',
1721              'ĭ' => 'i',
1722              'Į' => 'I',
1723              'į' => 'i',
1724              'İ' => 'I',
1725              'ı' => 'i',
1726              'IJ' => 'IJ',
1727              'ij' => 'ij',
1728              'Ĵ' => 'J',
1729              'ĵ' => 'j',
1730              'Ķ' => 'K',
1731              'ķ' => 'k',
1732              'ĸ' => 'k',
1733              'Ĺ' => 'L',
1734              'ĺ' => 'l',
1735              'Ļ' => 'L',
1736              'ļ' => 'l',
1737              'Ľ' => 'L',
1738              'ľ' => 'l',
1739              'Ŀ' => 'L',
1740              'ŀ' => 'l',
1741              'Ł' => 'L',
1742              'ł' => 'l',
1743              'Ń' => 'N',
1744              'ń' => 'n',
1745              'Ņ' => 'N',
1746              'ņ' => 'n',
1747              'Ň' => 'N',
1748              'ň' => 'n',
1749              'ʼn' => 'n',
1750              'Ŋ' => 'N',
1751              'ŋ' => 'n',
1752              'Ō' => 'O',
1753              'ō' => 'o',
1754              'Ŏ' => 'O',
1755              'ŏ' => 'o',
1756              'Ő' => 'O',
1757              'ő' => 'o',
1758              'Œ' => 'OE',
1759              'œ' => 'oe',
1760              'Ŕ' => 'R',
1761              'ŕ' => 'r',
1762              'Ŗ' => 'R',
1763              'ŗ' => 'r',
1764              'Ř' => 'R',
1765              'ř' => 'r',
1766              'Ś' => 'S',
1767              'ś' => 's',
1768              'Ŝ' => 'S',
1769              'ŝ' => 's',
1770              'Ş' => 'S',
1771              'ş' => 's',
1772              'Š' => 'S',
1773              'š' => 's',
1774              'Ţ' => 'T',
1775              'ţ' => 't',
1776              'Ť' => 'T',
1777              'ť' => 't',
1778              'Ŧ' => 'T',
1779              'ŧ' => 't',
1780              'Ũ' => 'U',
1781              'ũ' => 'u',
1782              'Ū' => 'U',
1783              'ū' => 'u',
1784              'Ŭ' => 'U',
1785              'ŭ' => 'u',
1786              'Ů' => 'U',
1787              'ů' => 'u',
1788              'Ű' => 'U',
1789              'ű' => 'u',
1790              'Ų' => 'U',
1791              'ų' => 'u',
1792              'Ŵ' => 'W',
1793              'ŵ' => 'w',
1794              'Ŷ' => 'Y',
1795              'ŷ' => 'y',
1796              'Ÿ' => 'Y',
1797              'Ź' => 'Z',
1798              'ź' => 'z',
1799              'Ż' => 'Z',
1800              'ż' => 'z',
1801              'Ž' => 'Z',
1802              'ž' => 'z',
1803              'ſ' => 's',
1804              // Decompositions for Latin Extended-B
1805              'Ș' => 'S',
1806              'ș' => 's',
1807              'Ț' => 'T',
1808              'ț' => 't',
1809              // Euro Sign
1810              '€' => 'E',
1811              // GBP (Pound) Sign
1812              '£' => '',
1813              // Vowels with diacritic (Vietnamese)
1814              // unmarked
1815              'Ơ' => 'O',
1816              'ơ' => 'o',
1817              'Ư' => 'U',
1818              'ư' => 'u',
1819              // grave accent
1820              'Ầ' => 'A',
1821              'ầ' => 'a',
1822              'Ằ' => 'A',
1823              'ằ' => 'a',
1824              'Ề' => 'E',
1825              'ề' => 'e',
1826              'Ồ' => 'O',
1827              'ồ' => 'o',
1828              'Ờ' => 'O',
1829              'ờ' => 'o',
1830              'Ừ' => 'U',
1831              'ừ' => 'u',
1832              'Ỳ' => 'Y',
1833              'ỳ' => 'y',
1834              // hook
1835              'Ả' => 'A',
1836              'ả' => 'a',
1837              'Ẩ' => 'A',
1838              'ẩ' => 'a',
1839              'Ẳ' => 'A',
1840              'ẳ' => 'a',
1841              'Ẻ' => 'E',
1842              'ẻ' => 'e',
1843              'Ể' => 'E',
1844              'ể' => 'e',
1845              'Ỉ' => 'I',
1846              'ỉ' => 'i',
1847              'Ỏ' => 'O',
1848              'ỏ' => 'o',
1849              'Ổ' => 'O',
1850              'ổ' => 'o',
1851              'Ở' => 'O',
1852              'ở' => 'o',
1853              'Ủ' => 'U',
1854              'ủ' => 'u',
1855              'Ử' => 'U',
1856              'ử' => 'u',
1857              'Ỷ' => 'Y',
1858              'ỷ' => 'y',
1859              // tilde
1860              'Ẫ' => 'A',
1861              'ẫ' => 'a',
1862              'Ẵ' => 'A',
1863              'ẵ' => 'a',
1864              'Ẽ' => 'E',
1865              'ẽ' => 'e',
1866              'Ễ' => 'E',
1867              'ễ' => 'e',
1868              'Ỗ' => 'O',
1869              'ỗ' => 'o',
1870              'Ỡ' => 'O',
1871              'ỡ' => 'o',
1872              'Ữ' => 'U',
1873              'ữ' => 'u',
1874              'Ỹ' => 'Y',
1875              'ỹ' => 'y',
1876              // acute accent
1877              'Ấ' => 'A',
1878              'ấ' => 'a',
1879              'Ắ' => 'A',
1880              'ắ' => 'a',
1881              'Ế' => 'E',
1882              'ế' => 'e',
1883              'Ố' => 'O',
1884              'ố' => 'o',
1885              'Ớ' => 'O',
1886              'ớ' => 'o',
1887              'Ứ' => 'U',
1888              'ứ' => 'u',
1889              // dot below
1890              'Ạ' => 'A',
1891              'ạ' => 'a',
1892              'Ậ' => 'A',
1893              'ậ' => 'a',
1894              'Ặ' => 'A',
1895              'ặ' => 'a',
1896              'Ẹ' => 'E',
1897              'ẹ' => 'e',
1898              'Ệ' => 'E',
1899              'ệ' => 'e',
1900              'Ị' => 'I',
1901              'ị' => 'i',
1902              'Ọ' => 'O',
1903              'ọ' => 'o',
1904              'Ộ' => 'O',
1905              'ộ' => 'o',
1906              'Ợ' => 'O',
1907              'ợ' => 'o',
1908              'Ụ' => 'U',
1909              'ụ' => 'u',
1910              'Ự' => 'U',
1911              'ự' => 'u',
1912              'Ỵ' => 'Y',
1913              'ỵ' => 'y',
1914              // Vowels with diacritic (Chinese, Hanyu Pinyin)
1915              'ɑ' => 'a',
1916              // macron
1917              'Ǖ' => 'U',
1918              'ǖ' => 'u',
1919              // acute accent
1920              'Ǘ' => 'U',
1921              'ǘ' => 'u',
1922              // caron
1923              'Ǎ' => 'A',
1924              'ǎ' => 'a',
1925              'Ǐ' => 'I',
1926              'ǐ' => 'i',
1927              'Ǒ' => 'O',
1928              'ǒ' => 'o',
1929              'Ǔ' => 'U',
1930              'ǔ' => 'u',
1931              'Ǚ' => 'U',
1932              'ǚ' => 'u',
1933              // grave accent
1934              'Ǜ' => 'U',
1935              'ǜ' => 'u',
1936          );
1937  
1938          // Used for locale-specific rules
1939          $locale = get_locale();
1940  
1941          if ( 'de_DE' == $locale || 'de_DE_formal' == $locale || 'de_CH' == $locale || 'de_CH_informal' == $locale ) {
1942              $chars['Ä'] = 'Ae';
1943              $chars['ä'] = 'ae';
1944              $chars['Ö'] = 'Oe';
1945              $chars['ö'] = 'oe';
1946              $chars['Ü'] = 'Ue';
1947              $chars['ü'] = 'ue';
1948              $chars['ß'] = 'ss';
1949          } elseif ( 'da_DK' === $locale ) {
1950              $chars['Æ'] = 'Ae';
1951              $chars['æ'] = 'ae';
1952              $chars['Ø'] = 'Oe';
1953              $chars['ø'] = 'oe';
1954              $chars['Å'] = 'Aa';
1955              $chars['å'] = 'aa';
1956          } elseif ( 'ca' === $locale ) {
1957              $chars['l·l'] = 'll';
1958          } elseif ( 'sr_RS' === $locale || 'bs_BA' === $locale ) {
1959              $chars['Đ'] = 'DJ';
1960              $chars['đ'] = 'dj';
1961          }
1962  
1963          $string = strtr( $string, $chars );
1964      } else {
1965          $chars = array();
1966          // Assume ISO-8859-1 if not UTF-8
1967          $chars['in'] = "\x80\x83\x8a\x8e\x9a\x9e"
1968              . "\x9f\xa2\xa5\xb5\xc0\xc1\xc2"
1969              . "\xc3\xc4\xc5\xc7\xc8\xc9\xca"
1970              . "\xcb\xcc\xcd\xce\xcf\xd1\xd2"
1971              . "\xd3\xd4\xd5\xd6\xd8\xd9\xda"
1972              . "\xdb\xdc\xdd\xe0\xe1\xe2\xe3"
1973              . "\xe4\xe5\xe7\xe8\xe9\xea\xeb"
1974              . "\xec\xed\xee\xef\xf1\xf2\xf3"
1975              . "\xf4\xf5\xf6\xf8\xf9\xfa\xfb"
1976              . "\xfc\xfd\xff";
1977  
1978          $chars['out'] = 'EfSZszYcYuAAAAAACEEEEIIIINOOOOOOUUUUYaaaaaaceeeeiiiinoooooouuuuyy';
1979  
1980          $string              = strtr( $string, $chars['in'], $chars['out'] );
1981          $double_chars        = array();
1982          $double_chars['in']  = array( "\x8c", "\x9c", "\xc6", "\xd0", "\xde", "\xdf", "\xe6", "\xf0", "\xfe" );
1983          $double_chars['out'] = array( 'OE', 'oe', 'AE', 'DH', 'TH', 'ss', 'ae', 'dh', 'th' );
1984          $string              = str_replace( $double_chars['in'], $double_chars['out'], $string );
1985      }
1986  
1987      return $string;
1988  }
1989  
1990  /**
1991   * Sanitizes a filename, replacing whitespace with dashes.
1992   *
1993   * Removes special characters that are illegal in filenames on certain
1994   * operating systems and special characters requiring special escaping
1995   * to manipulate at the command line. Replaces spaces and consecutive
1996   * dashes with a single dash. Trims period, dash and underscore from beginning
1997   * and end of filename. It is not guaranteed that this function will return a
1998   * filename that is allowed to be uploaded.
1999   *
2000   * @since 2.1.0
2001   *
2002   * @param string $filename The filename to be sanitized.
2003   * @return string The sanitized filename.
2004   */
2005  function sanitize_file_name( $filename ) {
2006      $filename_raw  = $filename;
2007      $special_chars = array( '?', '[', ']', '/', '\\', '=', '<', '>', ':', ';', ',', "'", '"', '&', '$', '#', '*', '(', ')', '|', '~', '`', '!', '{', '}', '%', '+', chr( 0 ) );
2008      /**
2009       * Filters the list of characters to remove from a filename.
2010       *
2011       * @since 2.8.0
2012       *
2013       * @param string[] $special_chars Array of characters to remove.
2014       * @param string   $filename_raw  The original filename to be sanitized.
2015       */
2016      $special_chars = apply_filters( 'sanitize_file_name_chars', $special_chars, $filename_raw );
2017      $filename      = preg_replace( "#\x{00a0}#siu", ' ', $filename );
2018      $filename      = str_replace( $special_chars, '', $filename );
2019      $filename      = str_replace( array( '%20', '+' ), '-', $filename );
2020      $filename      = preg_replace( '/[\r\n\t -]+/', '-', $filename );
2021      $filename      = trim( $filename, '.-_' );
2022  
2023      if ( false === strpos( $filename, '.' ) ) {
2024          $mime_types = wp_get_mime_types();
2025          $filetype   = wp_check_filetype( 'test.' . $filename, $mime_types );
2026          if ( $filetype['ext'] === $filename ) {
2027              $filename = 'unnamed-file.' . $filetype['ext'];
2028          }
2029      }
2030  
2031      // Split the filename into a base and extension[s]
2032      $parts = explode( '.', $filename );
2033  
2034      // Return if only one extension
2035      if ( count( $parts ) <= 2 ) {
2036          /**
2037           * Filters a sanitized filename string.
2038           *
2039           * @since 2.8.0
2040           *
2041           * @param string $filename     Sanitized filename.
2042           * @param string $filename_raw The filename prior to sanitization.
2043           */
2044          return apply_filters( 'sanitize_file_name', $filename, $filename_raw );
2045      }
2046  
2047      // Process multiple extensions
2048      $filename  = array_shift( $parts );
2049      $extension = array_pop( $parts );
2050      $mimes     = get_allowed_mime_types();
2051  
2052      /*
2053       * Loop over any intermediate extensions. Postfix them with a trailing underscore
2054       * if they are a 2 - 5 character long alpha string not in the extension whitelist.
2055       */
2056      foreach ( (array) $parts as $part ) {
2057          $filename .= '.' . $part;
2058  
2059          if ( preg_match( '/^[a-zA-Z]{2,5}\d?$/', $part ) ) {
2060              $allowed = false;
2061              foreach ( $mimes as $ext_preg => $mime_match ) {
2062                  $ext_preg = '!^(' . $ext_preg . ')$!i';
2063                  if ( preg_match( $ext_preg, $part ) ) {
2064                      $allowed = true;
2065                      break;
2066                  }
2067              }
2068              if ( ! $allowed ) {
2069                  $filename .= '_';
2070              }
2071          }
2072      }
2073      $filename .= '.' . $extension;
2074      /** This filter is documented in wp-includes/formatting.php */
2075      return apply_filters( 'sanitize_file_name', $filename, $filename_raw );
2076  }
2077  
2078  /**
2079   * Sanitizes a username, stripping out unsafe characters.
2080   *
2081   * Removes tags, octets, entities, and if strict is enabled, will only keep
2082   * alphanumeric, _, space, ., -, @. After sanitizing, it passes the username,
2083   * raw username (the username in the parameter), and the value of $strict as
2084   * parameters for the {@see 'sanitize_user'} filter.
2085   *
2086   * @since 2.0.0
2087   *
2088   * @param string $username The username to be sanitized.
2089   * @param bool   $strict   If set limits $username to specific characters. Default false.
2090   * @return string The sanitized username, after passing through filters.
2091   */
2092  function sanitize_user( $username, $strict = false ) {
2093      $raw_username = $username;
2094      $username     = wp_strip_all_tags( $username );
2095      $username     = remove_accents( $username );
2096      // Kill octets
2097      $username = preg_replace( '|%([a-fA-F0-9][a-fA-F0-9])|', '', $username );
2098      $username = preg_replace( '/&.+?;/', '', $username ); // Kill entities
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. Default false.
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, dashes and underscores are allowed.
2125   *
2126   * @since 3.0.0
2127   *
2128   * @param string $key String key
2129   * @return string Sanitized key
2130   */
2131  function sanitize_key( $key ) {
2132      $raw_key = $key;
2133      $key     = strtolower( $key );
2134      $key     = preg_replace( '/[^a-z0-9_\-]/', '', $key );
2135  
2136      /**
2137       * Filters a sanitized key string.
2138       *
2139       * @since 3.0.0
2140       *
2141       * @param string $key     Sanitized key.
2142       * @param string $raw_key The key prior to sanitization.
2143       */
2144      return apply_filters( 'sanitize_key', $key, $raw_key );
2145  }
2146  
2147  /**
2148   * Sanitizes a title, or returns a fallback title.
2149   *
2150   * Specifically, HTML and PHP tags are stripped. Further actions can be added
2151   * via the plugin API. If $title is empty and $fallback_title is set, the latter
2152   * will be used.
2153   *
2154   * @since 1.0.0
2155   *
2156   * @param string $title          The string to be sanitized.
2157   * @param string $fallback_title Optional. A title to use if $title is empty.
2158   * @param string $context        Optional. The operation for which the string is sanitized
2159   * @return string The sanitized string.
2160   */
2161  function sanitize_title( $title, $fallback_title = '', $context = 'save' ) {
2162      $raw_title = $title;
2163  
2164      if ( 'save' == $context ) {
2165          $title = remove_accents( $title );
2166      }
2167  
2168      /**
2169       * Filters a sanitized title string.
2170       *
2171       * @since 1.2.0
2172       *
2173       * @param string $title     Sanitized title.
2174       * @param string $raw_title The title prior to sanitization.
2175       * @param string $context   The context for which the title is being sanitized.
2176       */
2177      $title = apply_filters( 'sanitize_title', $title, $raw_title, $context );
2178  
2179      if ( '' === $title || false === $title ) {
2180          $title = $fallback_title;
2181      }
2182  
2183      return $title;
2184  }
2185  
2186  /**
2187   * Sanitizes a title with the 'query' context.
2188   *
2189   * Used for querying the database for a value from URL.
2190   *
2191   * @since 3.1.0
2192   *
2193   * @param string $title The string to be sanitized.
2194   * @return string The sanitized string.
2195   */
2196  function sanitize_title_for_query( $title ) {
2197      return sanitize_title( $title, '', 'query' );
2198  }
2199  
2200  /**
2201   * Sanitizes a title, replacing whitespace and a few other characters with dashes.
2202   *
2203   * Limits the output to alphanumeric characters, underscore (_) and dash (-).
2204   * Whitespace becomes a dash.
2205   *
2206   * @since 1.2.0
2207   *
2208   * @param string $title     The title to be sanitized.
2209   * @param string $raw_title Optional. Not used.
2210   * @param string $context   Optional. The operation for which the string is sanitized.
2211   * @return string The sanitized title.
2212   */
2213  function sanitize_title_with_dashes( $title, $raw_title = '', $context = 'display' ) {
2214      $title = strip_tags( $title );
2215      // Preserve escaped octets.
2216      $title = preg_replace( '|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title );
2217      // Remove percent signs that are not part of an octet.
2218      $title = str_replace( '%', '', $title );
2219      // Restore octets.
2220      $title = preg_replace( '|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title );
2221  
2222      if ( seems_utf8( $title ) ) {
2223          if ( function_exists( 'mb_strtolower' ) ) {
2224              $title = mb_strtolower( $title, 'UTF-8' );
2225          }
2226          $title = utf8_uri_encode( $title, 200 );
2227      }
2228  
2229      $title = strtolower( $title );
2230  
2231      if ( 'save' == $context ) {
2232          // Convert nbsp, ndash and mdash to hyphens
2233          $title = str_replace( array( '%c2%a0', '%e2%80%93', '%e2%80%94' ), '-', $title );
2234          // Convert nbsp, ndash and mdash HTML entities to hyphens
2235          $title = str_replace( array( '&nbsp;', '&#160;', '&ndash;', '&#8211;', '&mdash;', '&#8212;' ), '-', $title );
2236          // Convert forward slash to hyphen
2237          $title = str_replace( '/', '-', $title );
2238  
2239          // Strip these characters entirely
2240          $title = str_replace(
2241              array(
2242                  // soft hyphens
2243                  '%c2%ad',
2244                  // iexcl and iquest
2245                  '%c2%a1',
2246                  '%c2%bf',
2247                  // angle quotes
2248                  '%c2%ab',
2249                  '%c2%bb',
2250                  '%e2%80%b9',
2251                  '%e2%80%ba',
2252                  // curly quotes
2253                  '%e2%80%98',
2254                  '%e2%80%99',
2255                  '%e2%80%9c',
2256                  '%e2%80%9d',
2257                  '%e2%80%9a',
2258                  '%e2%80%9b',
2259                  '%e2%80%9e',
2260                  '%e2%80%9f',
2261                  // copy, reg, deg, hellip and trade
2262                  '%c2%a9',
2263                  '%c2%ae',
2264                  '%c2%b0',
2265                  '%e2%80%a6',
2266                  '%e2%84%a2',
2267                  // acute accents
2268                  '%c2%b4',
2269                  '%cb%8a',
2270                  '%cc%81',
2271                  '%cd%81',
2272                  // grave accent, macron, caron
2273                  '%cc%80',
2274                  '%cc%84',
2275                  '%cc%8c',
2276              ),
2277              '',
2278              $title
2279          );
2280  
2281          // Convert times to x
2282          $title = str_replace( '%c3%97', 'x', $title );
2283      }
2284  
2285      $title = preg_replace( '/&.+?;/', '', $title ); // kill entities
2286      $title = str_replace( '.', '-', $title );
2287  
2288      $title = preg_replace( '/[^%a-z0-9 _-]/', '', $title );
2289      $title = preg_replace( '/\s+/', '-', $title );
2290      $title = preg_replace( '|-+|', '-', $title );
2291      $title = trim( $title, '-' );
2292  
2293      return $title;
2294  }
2295  
2296  /**
2297   * Ensures a string is a valid SQL 'order by' clause.
2298   *
2299   * Accepts one or more columns, with or without a sort order (ASC / DESC).
2300   * e.g. 'column_1', 'column_1, column_2', 'column_1 ASC, column_2 DESC' etc.
2301   *
2302   * Also accepts 'RAND()'.
2303   *
2304   * @since 2.5.1
2305   *
2306   * @param string $orderby Order by clause to be validated.
2307   * @return string|false Returns $orderby if valid, false otherwise.
2308   */
2309  function sanitize_sql_orderby( $orderby ) {
2310      if ( preg_match( '/^\s*(([a-z0-9_]+|`[a-z0-9_]+`)(\s+(ASC|DESC))?\s*(,\s*(?=[a-z0-9_`])|$))+$/i', $orderby ) || preg_match( '/^\s*RAND\(\s*\)\s*$/i', $orderby ) ) {
2311          return $orderby;
2312      }
2313      return false;
2314  }
2315  
2316  /**
2317   * Sanitizes an HTML classname to ensure it only contains valid characters.
2318   *
2319   * Strips the string down to A-Z,a-z,0-9,_,-. If this results in an empty
2320   * string then it will return the alternative value supplied.
2321   *
2322   * @todo Expand to support the full range of CDATA that a class attribute can contain.
2323   *
2324   * @since 2.8.0
2325   *
2326   * @param string $class    The classname to be sanitized
2327   * @param string $fallback Optional. The value to return if the sanitization ends up as an empty string.
2328   *  Defaults to an empty string.
2329   * @return string The sanitized value
2330   */
2331  function sanitize_html_class( $class, $fallback = '' ) {
2332      //Strip out any % encoded octets
2333      $sanitized = preg_replace( '|%[a-fA-F0-9][a-fA-F0-9]|', '', $class );
2334  
2335      //Limit to A-Z,a-z,0-9,_,-
2336      $sanitized = preg_replace( '/[^A-Za-z0-9_-]/', '', $sanitized );
2337  
2338      if ( '' == $sanitized && $fallback ) {
2339          return sanitize_html_class( $fallback );
2340      }
2341      /**
2342       * Filters a sanitized HTML class string.
2343       *
2344       * @since 2.8.0
2345       *
2346       * @param string $sanitized The sanitized HTML class.
2347       * @param string $class     HTML class before sanitization.
2348       * @param string $fallback  The fallback string.
2349       */
2350      return apply_filters( 'sanitize_html_class', $sanitized, $class, $fallback );
2351  }
2352  
2353  /**
2354   * Converts lone & characters into `&#038;` (a.k.a. `&amp;`)
2355   *
2356   * @since 0.71
2357   *
2358   * @param string $content    String of characters to be converted.
2359   * @param string $deprecated Not used.
2360   * @return string Converted string.
2361   */
2362  function convert_chars( $content, $deprecated = '' ) {
2363      if ( ! empty( $deprecated ) ) {
2364          _deprecated_argument( __FUNCTION__, '0.71' );
2365      }
2366  
2367      if ( strpos( $content, '&' ) !== false ) {
2368          $content = preg_replace( '/&([^#])(?![a-z1-4]{1,8};)/i', '&#038;$1', $content );
2369      }
2370  
2371      return $content;
2372  }
2373  
2374  /**
2375   * Converts invalid Unicode references range to valid range.
2376   *
2377   * @since 4.3.0
2378   *
2379   * @param string $content String with entities that need converting.
2380   * @return string Converted string.
2381   */
2382  function convert_invalid_entities( $content ) {
2383      $wp_htmltranswinuni = array(
2384          '&#128;' => '&#8364;', // the Euro sign
2385          '&#129;' => '',
2386          '&#130;' => '&#8218;', // these are Windows CP1252 specific characters
2387          '&#131;' => '&#402;',  // they would look weird on non-Windows browsers
2388          '&#132;' => '&#8222;',
2389          '&#133;' => '&#8230;',
2390          '&#134;' => '&#8224;',
2391          '&#135;' => '&#8225;',
2392          '&#136;' => '&#710;',
2393          '&#137;' => '&#8240;',
2394          '&#138;' => '&#352;',
2395          '&#139;' => '&#8249;',
2396          '&#140;' => '&#338;',
2397          '&#141;' => '',
2398          '&#142;' => '&#381;',
2399          '&#143;' => '',
2400          '&#144;' => '',
2401          '&#145;' => '&#8216;',
2402          '&#146;' => '&#8217;',
2403          '&#147;' => '&#8220;',
2404          '&#148;' => '&#8221;',
2405          '&#149;' => '&#8226;',
2406          '&#150;' => '&#8211;',
2407          '&#151;' => '&#8212;',
2408          '&#152;' => '&#732;',
2409          '&#153;' => '&#8482;',
2410          '&#154;' => '&#353;',
2411          '&#155;' => '&#8250;',
2412          '&#156;' => '&#339;',
2413          '&#157;' => '',
2414          '&#158;' => '&#382;',
2415          '&#159;' => '&#376;',
2416      );
2417  
2418      if ( strpos( $content, '&#1' ) !== false ) {
2419          $content = strtr( $content, $wp_htmltranswinuni );
2420      }
2421  
2422      return $content;
2423  }
2424  
2425  /**
2426   * Balances tags if forced to, or if the 'use_balanceTags' option is set to true.
2427   *
2428   * @since 0.71
2429   *
2430   * @param string $text  Text to be balanced
2431   * @param bool   $force If true, forces balancing, ignoring the value of the option. Default false.
2432   * @return string Balanced text
2433   */
2434  function balanceTags( $text, $force = false ) {  // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
2435      if ( $force || (int) get_option( 'use_balanceTags' ) === 1 ) {
2436          return force_balance_tags( $text );
2437      } else {
2438          return $text;
2439      }
2440  }
2441  
2442  /**
2443   * Balances tags of string using a modified stack.
2444   *
2445   * @since 2.0.4
2446   * @since 5.3.0 Improve accuracy and add support for custom element tags.
2447   *
2448   * @author Leonard Lin <leonard@acm.org>
2449   * @license GPL
2450   * @copyright November 4, 2001
2451   * @version 1.1
2452   * @todo Make better - change loop condition to $text in 1.2
2453   * @internal Modified by Scott Reilly (coffee2code) 02 Aug 2004
2454   *      1.1  Fixed handling of append/stack pop order of end text
2455   *           Added Cleaning Hooks
2456   *      1.0  First Version
2457   *
2458   * @param string $text Text to be balanced.
2459   * @return string Balanced text.
2460   */
2461  function force_balance_tags( $text ) {
2462      $tagstack  = array();
2463      $stacksize = 0;
2464      $tagqueue  = '';
2465      $newtext   = '';
2466      // Known single-entity/self-closing tags
2467      $single_tags = array( 'area', 'base', 'basefont', 'br', 'col', 'command', 'embed', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param', 'source' );
2468      // Tags that can be immediately nested within themselves
2469      $nestable_tags = array( 'blockquote', 'div', 'object', 'q', 'span' );
2470  
2471      // WP bug fix for comments - in case you REALLY meant to type '< !--'
2472      $text = str_replace( '< !--', '<    !--', $text );
2473      // WP bug fix for LOVE <3 (and other situations with '<' before a number)
2474      $text = preg_replace( '#<([0-9]{1})#', '&lt;$1', $text );
2475  
2476      /**
2477       * Matches supported tags.
2478       *
2479       * To get the pattern as a string without the comments paste into a PHP
2480       * REPL like `php -a`.
2481       *
2482       * @see https://html.spec.whatwg.org/#elements-2
2483       * @see https://w3c.github.io/webcomponents/spec/custom/#valid-custom-element-name
2484       *
2485       * @example
2486       * ~# php -a
2487       * php > $s = [paste copied contents of expression below including parentheses];
2488       * php > echo $s;
2489       */
2490      $tag_pattern = (
2491          '#<' . // Start with an opening bracket.
2492          '(/?)' . // Group 1 - If it's a closing tag it'll have a leading slash.
2493          '(' . // Group 2 - Tag name.
2494              // Custom element tags have more lenient rules than HTML tag names.
2495              '(?:[a-z](?:[a-z0-9._]*)-(?:[a-z0-9._-]+)+)' .
2496                  '|' .
2497              // Traditional tag rules approximate HTML tag names.
2498              '(?:[\w:]+)' .
2499          ')' .
2500          '(?:' .
2501              // We either immediately close the tag with its '>' and have nothing here.
2502              '\s*' .
2503              '(/?)' . // Group 3 - "attributes" for empty tag.
2504                  '|' .
2505              // Or we must start with space characters to separate the tag name from the attributes (or whitespace).
2506              '(\s+)' . // Group 4 - Pre-attribute whitespace.
2507              '([^>]*)' . // Group 5 - Attributes.
2508          ')' .
2509          '>#' // End with a closing bracket.
2510      );
2511  
2512      while ( preg_match( $tag_pattern, $text, $regex ) ) {
2513          $full_match        = $regex[0];
2514          $has_leading_slash = ! empty( $regex[1] );
2515          $tag_name          = $regex[2];
2516          $tag               = strtolower( $tag_name );
2517          $is_single_tag     = in_array( $tag, $single_tags, true );
2518          $pre_attribute_ws  = isset( $regex[4] ) ? $regex[4] : '';
2519          $attributes        = trim( isset( $regex[5] ) ? $regex[5] : $regex[3] );
2520          $has_self_closer   = '/' === substr( $attributes, -1 );
2521  
2522          $newtext .= $tagqueue;
2523  
2524          $i = strpos( $text, $full_match );
2525          $l = strlen( $full_match );
2526  
2527          // Clear the shifter.
2528          $tagqueue = '';
2529          if ( $has_leading_slash ) { // End Tag.
2530              // If too many closing tags.
2531              if ( $stacksize <= 0 ) {
2532                  $tag = '';
2533                  // Or close to be safe $tag = '/' . $tag.
2534  
2535                  // If stacktop value = tag close value, then pop.
2536              } elseif ( $tagstack[ $stacksize - 1 ] === $tag ) { // Found closing tag.
2537                  $tag = '</' . $tag . '>'; // Close Tag.
2538                  array_pop( $tagstack );
2539                  $stacksize--;
2540              } else { // Closing tag not at top, search for it.
2541                  for ( $j = $stacksize - 1; $j >= 0; $j-- ) {
2542                      if ( $tagstack[ $j ] === $tag ) {
2543                          // Add tag to tagqueue.
2544                          for ( $k = $stacksize - 1; $k >= $j; $k-- ) {
2545                              $tagqueue .= '</' . array_pop( $tagstack ) . '>';
2546                              $stacksize--;
2547                          }
2548                          break;
2549                      }
2550                  }
2551                  $tag = '';
2552              }
2553          } else { // Begin Tag.
2554              if ( $has_self_closer ) { // If it presents itself as a self-closing tag...
2555                  // ...but it isn't a known single-entity self-closing tag, then don't let it be treated as such and
2556                  // immediately close it with a closing tag (the tag will encapsulate no text as a result)
2557                  if ( ! $is_single_tag ) {
2558                      $attributes = trim( substr( $attributes, 0, -1 ) ) . "></$tag";
2559                  }
2560              } elseif ( $is_single_tag ) { // ElseIf it's a known single-entity tag but it doesn't close itself, do so
2561                  $pre_attribute_ws = ' ';
2562                  $attributes      .= '/';
2563              } else { // It's not a single-entity tag.
2564                  // If the top of the stack is the same as the tag we want to push, close previous tag.
2565                  if ( $stacksize > 0 && ! in_array( $tag, $nestable_tags, true ) && $tagstack[ $stacksize - 1 ] === $tag ) {
2566                      $tagqueue = '</' . array_pop( $tagstack ) . '>';
2567                      $stacksize--;
2568                  }
2569                  $stacksize = array_push( $tagstack, $tag );
2570              }
2571  
2572              // Attributes.
2573              if ( $has_self_closer && $is_single_tag ) {
2574                  // We need some space - avoid <br/> and prefer <br />.
2575                  $pre_attribute_ws = ' ';
2576              }
2577  
2578              $tag = '<' . $tag . $pre_attribute_ws . $attributes . '>';
2579              // If already queuing a close tag, then put this tag on too.
2580              if ( ! empty( $tagqueue ) ) {
2581                  $tagqueue .= $tag;
2582                  $tag       = '';
2583              }
2584          }
2585          $newtext .= substr( $text, 0, $i ) . $tag;
2586          $text     = substr( $text, $i + $l );
2587      }
2588  
2589      // Clear Tag Queue.
2590      $newtext .= $tagqueue;
2591  
2592      // Add remaining text.
2593      $newtext .= $text;
2594  
2595      while ( $x = array_pop( $tagstack ) ) {
2596          $newtext .= '</' . $x . '>'; // Add remaining tags to close.
2597      }
2598  
2599      // WP fix for the bug with HTML comments.
2600      $newtext = str_replace( '< !--', '<!--', $newtext );
2601      $newtext = str_replace( '<    !--', '< !--', $newtext );
2602  
2603      return $newtext;
2604  }
2605  
2606  /**
2607   * Acts on text which is about to be edited.
2608   *
2609   * The $content is run through esc_textarea(), which uses htmlspecialchars()
2610   * to convert special characters to HTML entities. If `$richedit` is set to true,
2611   * it is simply a holder for the {@see 'format_to_edit'} filter.
2612   *
2613   * @since 0.71
2614   * @since 4.4.0 The `$richedit` parameter was renamed to `$rich_text` for clarity.
2615   *
2616   * @param string $content   The text about to be edited.
2617   * @param bool   $rich_text Optional. Whether `$content` should be considered rich text,
2618   *                          in which case it would not be passed through esc_textarea().
2619   *                          Default false.
2620   * @return string The text after the filter (and possibly htmlspecialchars()) has been run.
2621   */
2622  function format_to_edit( $content, $rich_text = false ) {
2623      /**
2624       * Filters the text to be formatted for editing.
2625       *
2626       * @since 1.2.0
2627       *
2628       * @param string $content The text, prior to formatting for editing.
2629       */
2630      $content = apply_filters( 'format_to_edit', $content );
2631      if ( ! $rich_text ) {
2632          $content = esc_textarea( $content );
2633      }
2634      return $content;
2635  }
2636  
2637  /**
2638   * Add leading zeros when necessary.
2639   *
2640   * If you set the threshold to '4' and the number is '10', then you will get
2641   * back '0010'. If you set the threshold to '4' and the number is '5000', then you
2642   * will get back '5000'.
2643   *
2644   * Uses sprintf to append the amount of zeros based on the $threshold parameter
2645   * and the size of the number. If the number is large enough, then no zeros will
2646   * be appended.
2647   *
2648   * @since 0.71
2649   *
2650   * @param int $number     Number to append zeros to if not greater than threshold.
2651   * @param int $threshold  Digit places number needs to be to not have zeros added.
2652   * @return string Adds leading zeros to number if needed.
2653   */
2654  function zeroise( $number, $threshold ) {
2655      return sprintf( '%0' . $threshold . 's', $number );
2656  }
2657  
2658  /**
2659   * Adds backslashes before letters and before a number at the start of a string.
2660   *
2661   * @since 0.71
2662   *
2663   * @param string $string Value to which backslashes will be added.
2664   * @return string String with backslashes inserted.
2665   */
2666  function backslashit( $string ) {
2667      if ( isset( $string[0] ) && $string[0] >= '0' && $string[0] <= '9' ) {
2668          $string = '\\\\' . $string;
2669      }
2670      return addcslashes( $string, 'A..Za..z' );
2671  }
2672  
2673  /**
2674   * Appends a trailing slash.
2675   *
2676   * Will remove trailing forward and backslashes if it exists already before adding
2677   * a trailing forward slash. This prevents double slashing a string or path.
2678   *
2679   * The primary use of this is for paths and thus should be used for paths. It is
2680   * not restricted to paths and offers no specific path support.
2681   *
2682   * @since 1.2.0
2683   *
2684   * @param string $string What to add the trailing slash to.
2685   * @return string String with trailing slash added.
2686   */
2687  function trailingslashit( $string ) {
2688      return untrailingslashit( $string ) . '/';
2689  }
2690  
2691  /**
2692   * Removes trailing forward slashes and backslashes if they exist.
2693   *
2694   * The primary use of this is for paths and thus should be used for paths. It is
2695   * not restricted to paths and offers no specific path support.
2696   *
2697   * @since 2.2.0
2698   *
2699   * @param string $string What to remove the trailing slashes from.
2700   * @return string String without the trailing slashes.
2701   */
2702  function untrailingslashit( $string ) {
2703      return rtrim( $string, '/\\' );
2704  }
2705  
2706  /**
2707   * Adds slashes to escape strings.
2708   *
2709   * Slashes will first be removed if magic_quotes_gpc is set, see {@link
2710   * https://www.php.net/magic_quotes} for more details.
2711   *
2712   * @since 0.71
2713   *
2714   * @param string $gpc The string returned from HTTP request data.
2715   * @return string Returns a string escaped with slashes.
2716   */
2717  function addslashes_gpc( $gpc ) {
2718      return wp_slash( $gpc );
2719  }
2720  
2721  /**
2722   * Navigates through an array, object, or scalar, and removes slashes from the values.
2723   *
2724   * @since 2.0.0
2725   *
2726   * @param mixed $value The value to be stripped.
2727   * @return mixed Stripped value.
2728   */
2729  function stripslashes_deep( $value ) {
2730      return map_deep( $value, 'stripslashes_from_strings_only' );
2731  }
2732  
2733  /**
2734   * Callback function for `stripslashes_deep()` which strips slashes from strings.
2735   *
2736   * @since 4.4.0
2737   *
2738   * @param mixed $value The array or string to be stripped.
2739   * @return mixed $value The stripped value.
2740   */
2741  function stripslashes_from_strings_only( $value ) {
2742      return is_string( $value ) ? stripslashes( $value ) : $value;
2743  }
2744  
2745  /**
2746   * Navigates through an array, object, or scalar, and encodes the values to be used in a URL.
2747   *
2748   * @since 2.2.0
2749   *
2750   * @param mixed $value The array or string to be encoded.
2751   * @return mixed $value The encoded value.
2752   */
2753  function urlencode_deep( $value ) {
2754      return map_deep( $value, 'urlencode' );
2755  }
2756  
2757  /**
2758   * Navigates through an array, object, or scalar, and raw-encodes the values to be used in a URL.
2759   *
2760   * @since 3.4.0
2761   *
2762   * @param mixed $value The array or string to be encoded.
2763   * @return mixed $value The encoded value.
2764   */
2765  function rawurlencode_deep( $value ) {
2766      return map_deep( $value, 'rawurlencode' );
2767  }
2768  
2769  /**
2770   * Navigates through an array, object, or scalar, and decodes URL-encoded values
2771   *
2772   * @since 4.4.0
2773   *
2774   * @param mixed $value The array or string to be decoded.
2775   * @return mixed $value The decoded value.
2776   */
2777  function urldecode_deep( $value ) {
2778      return map_deep( $value, 'urldecode' );
2779  }
2780  
2781  /**
2782   * Converts email addresses characters to HTML entities to block spam bots.
2783   *
2784   * @since 0.71
2785   *
2786   * @param string $email_address Email address.
2787   * @param int    $hex_encoding  Optional. Set to 1 to enable hex encoding.
2788   * @return string Converted email address.
2789   */
2790  function antispambot( $email_address, $hex_encoding = 0 ) {
2791      $email_no_spam_address = '';
2792      for ( $i = 0, $len = strlen( $email_address ); $i < $len; $i++ ) {
2793          $j = rand( 0, 1 + $hex_encoding );
2794          if ( $j == 0 ) {
2795              $email_no_spam_address .= '&#' . ord( $email_address[ $i ] ) . ';';
2796          } elseif ( $j == 1 ) {
2797              $email_no_spam_address .= $email_address[ $i ];
2798          } elseif ( $j == 2 ) {
2799              $email_no_spam_address .= '%' . zeroise( dechex( ord( $email_address[ $i ] ) ), 2 );
2800          }
2801      }
2802  
2803      return str_replace( '@', '&#64;', $email_no_spam_address );
2804  }
2805  
2806  /**
2807   * Callback to convert URI match to HTML A element.
2808   *
2809   * This function was backported from 2.5.0 to 2.3.2. Regex callback for make_clickable().
2810   *
2811   * @since 2.3.2
2812   * @access private
2813   *
2814   * @param array $matches Single Regex Match.
2815   * @return string HTML A element with URI address.
2816   */
2817  function _make_url_clickable_cb( $matches ) {
2818      $url = $matches[2];
2819  
2820      if ( ')' == $matches[3] && strpos( $url, '(' ) ) {
2821          // If the trailing character is a closing parethesis, and the URL has an opening parenthesis in it, add the closing parenthesis to the URL.
2822          // Then we can let the parenthesis balancer do its thing below.
2823          $url   .= $matches[3];
2824          $suffix = '';
2825      } else {
2826          $suffix = $matches[3];
2827      }
2828  
2829      // Include parentheses in the URL only if paired
2830      while ( substr_count( $url, '(' ) < substr_count( $url, ')' ) ) {
2831          $suffix = strrchr( $url, ')' ) . $suffix;
2832          $url    = substr( $url, 0, strrpos( $url, ')' ) );
2833      }
2834  
2835      $url = esc_url( $url );
2836      if ( empty( $url ) ) {
2837          return $matches[0];
2838      }
2839  
2840      if ( 'comment_text' === current_filter() ) {
2841          $rel = 'nofollow ugc';
2842      } else {
2843          $rel = 'nofollow';
2844      }
2845  
2846      /**
2847       * Filters the rel value that is added to URL matches converted to links.
2848       *
2849       * @since 5.3.0
2850       *
2851       * @param string $rel The rel value.
2852       * @param string $url The matched URL being converted to a link tag.
2853       */
2854      $rel = apply_filters( 'make_clickable_rel', $rel, $url );
2855      $rel = esc_attr( $rel );
2856  
2857      return $matches[1] . "<a href=\"$url\" rel=\"$rel\">$url</a>" . $suffix;
2858  }
2859  
2860  /**
2861   * Callback to convert URL match to HTML A element.
2862   *
2863   * This function was backported from 2.5.0 to 2.3.2. Regex callback for make_clickable().
2864   *
2865   * @since 2.3.2
2866   * @access private
2867   *
2868   * @param array $matches Single Regex Match.
2869   * @return string HTML A element with URL address.
2870   */
2871  function _make_web_ftp_clickable_cb( $matches ) {
2872      $ret  = '';
2873      $dest = $matches[2];
2874      $dest = 'http://' . $dest;
2875  
2876      // removed trailing [.,;:)] from URL
2877      if ( in_array( substr( $dest, -1 ), array( '.', ',', ';', ':', ')' ) ) === true ) {
2878          $ret  = substr( $dest, -1 );
2879          $dest = substr( $dest, 0, strlen( $dest ) - 1 );
2880      }
2881  
2882      $dest = esc_url( $dest );
2883      if ( empty( $dest ) ) {
2884          return $matches[0];
2885      }
2886  
2887      if ( 'comment_text' === current_filter() ) {
2888          $rel = 'nofollow ugc';
2889      } else {
2890          $rel = 'nofollow';
2891      }
2892  
2893      /** This filter is documented in wp-includes/formatting.php */
2894      $rel = apply_filters( 'make_clickable_rel', $rel, $dest );
2895      $rel = esc_attr( $rel );
2896  
2897      return $matches[1] . "<a href=\"$dest\" rel=\"$rel\">$dest</a>$ret";
2898  }
2899  
2900  /**
2901   * Callback to convert email address match to HTML A element.
2902   *
2903   * This function was backported from 2.5.0 to 2.3.2. Regex callback for make_clickable().
2904   *
2905   * @since 2.3.2
2906   * @access private
2907   *
2908   * @param array $matches Single Regex Match.
2909   * @return string HTML A element with email address.
2910   */
2911  function _make_email_clickable_cb( $matches ) {
2912      $email = $matches[2] . '@' . $matches[3];
2913      return $matches[1] . "<a href=\"mailto:$email\">$email</a>";
2914  }
2915  
2916  /**
2917   * Convert plaintext URI to HTML links.
2918   *
2919   * Converts URI, www and ftp, and email addresses. Finishes by fixing links
2920   * within links.
2921   *
2922   * @since 0.71
2923   *
2924   * @param string $text Content to convert URIs.
2925   * @return string Content with converted URIs.
2926   */
2927  function make_clickable( $text ) {
2928      $r               = '';
2929      $textarr         = preg_split( '/(<[^<>]+>)/', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // split out HTML tags
2930      $nested_code_pre = 0; // Keep track of how many levels link is nested inside <pre> or <code>
2931      foreach ( $textarr as $piece ) {
2932  
2933          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 ) ) {
2934              $nested_code_pre++;
2935          } elseif ( $nested_code_pre && ( '</code>' === strtolower( $piece ) || '</pre>' === strtolower( $piece ) || '</script>' === strtolower( $piece ) || '</style>' === strtolower( $piece ) ) ) {
2936              $nested_code_pre--;
2937          }
2938  
2939          if ( $nested_code_pre || empty( $piece ) || ( $piece[0] === '<' && ! preg_match( '|^<\s*[\w]{1,20}+://|', $piece ) ) ) {
2940              $r .= $piece;
2941              continue;
2942          }
2943  
2944          // Long strings might contain expensive edge cases ...
2945          if ( 10000 < strlen( $piece ) ) {
2946              // ... break it up
2947              foreach ( _split_str_by_whitespace( $piece, 2100 ) as $chunk ) { // 2100: Extra room for scheme and leading and trailing paretheses
2948                  if ( 2101 < strlen( $chunk ) ) {
2949                      $r .= $chunk; // Too big, no whitespace: bail.
2950                  } else {
2951                      $r .= make_clickable( $chunk );
2952                  }
2953              }
2954          } else {
2955              $ret = " $piece "; // Pad with whitespace to simplify the regexes
2956  
2957              $url_clickable = '~
2958                  ([\\s(<.,;:!?])                                        # 1: Leading whitespace, or punctuation
2959                  (                                                      # 2: URL
2960                      [\\w]{1,20}+://                                # Scheme and hier-part prefix
2961                      (?=\S{1,2000}\s)                               # Limit to URLs less than about 2000 characters long
2962                      [\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]*+         # Non-punctuation URL character
2963                      (?:                                            # Unroll the Loop: Only allow puctuation URL character if followed by a non-punctuation URL character
2964                          [\'.,;:!?)]                            # Punctuation URL character
2965                          [\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]++ # Non-punctuation URL character
2966                      )*
2967                  )
2968                  (\)?)                                                  # 3: Trailing closing parenthesis (for parethesis balancing post processing)
2969              ~xS';
2970              // The regex is a non-anchored pattern and does not have a single fixed starting character.
2971              // Tell PCRE to spend more time optimizing since, when used on a page load, it will probably be used several times.
2972  
2973              $ret = preg_replace_callback( $url_clickable, '_make_url_clickable_cb', $ret );
2974  
2975              $ret = preg_replace_callback( '#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]+)#is', '_make_web_ftp_clickable_cb', $ret );
2976              $ret = preg_replace_callback( '#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret );
2977  
2978              $ret = substr( $ret, 1, -1 ); // Remove our whitespace padding.
2979              $r  .= $ret;
2980          }
2981      }
2982  
2983      // Cleanup of accidental links within links
2984      return preg_replace( '#(<a([ \r\n\t]+[^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i', '$1$3</a>', $r );
2985  }
2986  
2987  /**
2988   * Breaks a string into chunks by splitting at whitespace characters.
2989   * The length of each returned chunk is as close to the specified length goal as possible,
2990   * with the caveat that each chunk includes its trailing delimiter.
2991   * Chunks longer than the goal are guaranteed to not have any inner whitespace.
2992   *
2993   * Joining the returned chunks with empty delimiters reconstructs the input string losslessly.
2994   *
2995   * Input string must have no null characters (or eventual transformations on output chunks must not care about null characters)
2996   *
2997   *     _split_str_by_whitespace( "1234 67890 1234 67890a cd 1234   890 123456789 1234567890a    45678   1 3 5 7 90 ", 10 ) ==
2998   *     array (
2999   *         0 => '1234 67890 ',  // 11 characters: Perfect split
3000   *         1 => '1234 ',        //  5 characters: '1234 67890a' was too long
3001   *         2 => '67890a cd ',   // 10 characters: '67890a cd 1234' was too long
3002   *         3 => '1234   890 ',  // 11 characters: Perfect split
3003   *         4 => '123456789 ',   // 10 characters: '123456789 1234567890a' was too long
3004   *         5 => '1234567890a ', // 12 characters: Too long, but no inner whitespace on which to split
3005   *         6 => '   45678   ',  // 11 characters: Perfect split
3006   *         7 => '1 3 5 7 90 ',  // 11 characters: End of $string
3007   *     );
3008   *
3009   * @since 3.4.0
3010   * @access private
3011   *
3012   * @param string $string The string to split.
3013   * @param int    $goal   The desired chunk length.
3014   * @return array Numeric array of chunks.
3015   */
3016  function _split_str_by_whitespace( $string, $goal ) {
3017      $chunks = array();
3018  
3019      $string_nullspace = strtr( $string, "\r\n\t\v\f ", "\000\000\000\000\000\000" );
3020  
3021      while ( $goal < strlen( $string_nullspace ) ) {
3022          $pos = strrpos( substr( $string_nullspace, 0, $goal + 1 ), "\000" );
3023  
3024          if ( false === $pos ) {
3025              $pos = strpos( $string_nullspace, "\000", $goal + 1 );
3026              if ( false === $pos ) {
3027                  break;
3028              }
3029          }
3030  
3031          $chunks[]         = substr( $string, 0, $pos + 1 );
3032          $string           = substr( $string, $pos + 1 );
3033          $string_nullspace = substr( $string_nullspace, $pos + 1 );
3034      }
3035  
3036      if ( $string ) {
3037          $chunks[] = $string;
3038      }
3039  
3040      return $chunks;
3041  }
3042  
3043  /**
3044   * Callback to add a rel attribute to HTML A element.
3045   *
3046   * Will remove already existing string before adding to prevent invalidating (X)HTML.
3047   *
3048   * @since 5.3.0
3049   *
3050   * @param array  $matches Single match.
3051   * @param string $rel     The rel attribute to add.
3052   * @return string HTML A element with the added rel attribute.
3053   */
3054  function wp_rel_callback( $matches, $rel ) {
3055      $text = $matches[1];
3056      $atts = wp_kses_hair( $matches[1], wp_allowed_protocols() );
3057  
3058      if ( ! empty( $atts['href'] ) ) {
3059          if ( in_array( strtolower( wp_parse_url( $atts['href']['value'], PHP_URL_SCHEME ) ), array( 'http', 'https' ), true ) ) {
3060              if ( strtolower( wp_parse_url( $atts['href']['value'], PHP_URL_HOST ) ) === strtolower( wp_parse_url( home_url(), PHP_URL_HOST ) ) ) {
3061                  return "<a $text>";
3062              }
3063          }
3064      }
3065  
3066      if ( ! empty( $atts['rel'] ) ) {
3067          $parts     = array_map( 'trim', explode( ' ', $atts['rel']['value'] ) );
3068          $rel_array = array_map( 'trim', explode( ' ', $rel ) );
3069          $parts     = array_unique( array_merge( $parts, $rel_array ) );
3070          $rel       = implode( ' ', $parts );
3071          unset( $atts['rel'] );
3072  
3073          $html = '';
3074          foreach ( $atts as $name => $value ) {
3075              if ( isset( $value['vless'] ) && 'y' === $value['vless'] ) {
3076                  $html .= $name . ' ';
3077              } else {
3078                  $html .= "{$name}=\"" . esc_attr( $value['value'] ) . '" ';
3079              }
3080          }
3081          $text = trim( $html );
3082      }
3083      return "<a $text rel=\"" . esc_attr( $rel ) . '">';
3084  }
3085  
3086  /**
3087   * Adds `rel="nofollow"` string to all HTML A elements in content.
3088   *
3089   * @since 1.5.0
3090   *
3091   * @param string $text Content that may contain HTML A elements.
3092   * @return string Converted content.
3093   */
3094  function wp_rel_nofollow( $text ) {
3095      // This is a pre-save filter, so text is already escaped.
3096      $text = stripslashes( $text );
3097      $text = preg_replace_callback(
3098          '|<a (.+?)>|i',
3099          function( $matches ) {
3100              return wp_rel_callback( $matches, 'nofollow' );
3101          },
3102          $text
3103      );
3104      return wp_slash( $text );
3105  }
3106  
3107  /**
3108   * Callback to add `rel="nofollow"` string to HTML A element.
3109   *
3110   * @since 2.3.0
3111   * @deprecated 5.3.0 Use wp_rel_callback()
3112   *
3113   * @param array $matches Single match.
3114   * @return string HTML A Element with `rel="nofollow"`.
3115   */
3116  function wp_rel_nofollow_callback( $matches ) {
3117      return wp_rel_callback( $matches, 'nofollow' );
3118  }
3119  
3120  /**
3121   * Adds `rel="nofollow ugc"` string to all HTML A elements in content.
3122   *
3123   * @since 5.3.0
3124   *
3125   * @param string $text Content that may contain HTML A elements.
3126   * @return string Converted content.
3127   */
3128  function wp_rel_ugc( $text ) {
3129      // This is a pre-save filter, so text is already escaped.
3130      $text = stripslashes( $text );
3131      $text = preg_replace_callback(
3132          '|<a (.+?)>|i',
3133          function( $matches ) {
3134              return wp_rel_callback( $matches, 'nofollow ugc' );
3135          },
3136          $text
3137      );
3138      return wp_slash( $text );
3139  }
3140  
3141  /**
3142   * Adds rel noreferrer and noopener to all HTML A elements that have a target.
3143   *
3144   * @since 5.1.0
3145   *
3146   * @param string $text Content that may contain HTML A elements.
3147   * @return string Converted content.
3148   */
3149  function wp_targeted_link_rel( $text ) {
3150      // Don't run (more expensive) regex if no links with targets.
3151      if ( stripos( $text, 'target' ) === false || stripos( $text, '<a ' ) === false || is_serialized( $text ) ) {
3152          return $text;
3153      }
3154  
3155      $script_and_style_regex = '/<(script|style).*?<\/\\1>/si';
3156  
3157      preg_match_all( $script_and_style_regex, $text, $matches );
3158      $extra_parts = $matches[0];
3159      $html_parts  = preg_split( $script_and_style_regex, $text );
3160  
3161      foreach ( $html_parts as &$part ) {
3162          $part = preg_replace_callback( '|<a\s([^>]*target\s*=[^>]*)>|i', 'wp_targeted_link_rel_callback', $part );
3163      }
3164  
3165      $text = '';
3166      for ( $i = 0; $i < count( $html_parts ); $i++ ) {
3167          $text .= $html_parts[ $i ];
3168          if ( isset( $extra_parts[ $i ] ) ) {
3169              $text .= $extra_parts[ $i ];
3170          }
3171      }
3172  
3173      return $text;
3174  }
3175  
3176  /**
3177   * Callback to add rel="noreferrer noopener" string to HTML A element.
3178   *
3179   * Will not duplicate existing noreferrer and noopener values
3180   * to prevent from invalidating the HTML.
3181   *
3182   * @since 5.1.0
3183   *
3184   * @param array $matches Single Match
3185   * @return string HTML A Element with rel noreferrer noopener in addition to any existing values
3186   */
3187  function wp_targeted_link_rel_callback( $matches ) {
3188      $link_html          = $matches[1];
3189      $original_link_html = $link_html;
3190  
3191      // Consider the html escaped if there are no unescaped quotes
3192      $is_escaped = ! preg_match( '/(^|[^\\\\])[\'"]/', $link_html );
3193      if ( $is_escaped ) {
3194          // Replace only the quotes so that they are parsable by wp_kses_hair, leave the rest as is
3195          $link_html = preg_replace( '/\\\\([\'"])/', '$1', $link_html );
3196      }
3197  
3198      $atts = wp_kses_hair( $link_html, wp_allowed_protocols() );
3199  
3200      /**
3201       * Filters the rel values that are added to links with `target` attribute.
3202       *
3203       * @since 5.1.0
3204       *
3205       * @param string $rel       The rel values.
3206       * @param string $link_html The matched content of the link tag including all HTML attributes.
3207       */
3208      $rel = apply_filters( 'wp_targeted_link_rel', 'noopener noreferrer', $link_html );
3209  
3210      // Return early if no rel values to be added or if no actual target attribute
3211      if ( ! $rel || ! isset( $atts['target'] ) ) {
3212          return "<a $original_link_html>";
3213      }
3214  
3215      if ( isset( $atts['rel'] ) ) {
3216          $all_parts = preg_split( '/\s/', "{$atts['rel']['value']} $rel", -1, PREG_SPLIT_NO_EMPTY );
3217          $rel       = implode( ' ', array_unique( $all_parts ) );
3218      }
3219  
3220      $atts['rel']['whole'] = 'rel="' . esc_attr( $rel ) . '"';
3221      $link_html            = join( ' ', array_column( $atts, 'whole' ) );
3222  
3223      if ( $is_escaped ) {
3224          $link_html = preg_replace( '/[\'"]/', '\\\\$0', $link_html );
3225      }
3226  
3227      return "<a $link_html>";
3228  }
3229  
3230  /**
3231   * Adds all filters modifying the rel attribute of targeted links.
3232   *
3233   * @since 5.1.0
3234   */
3235  function wp_init_targeted_link_rel_filters() {
3236      $filters = array(
3237          'title_save_pre',
3238          'content_save_pre',
3239          'excerpt_save_pre',
3240          'content_filtered_save_pre',
3241          'pre_comment_content',
3242          'pre_term_description',
3243          'pre_link_description',
3244          'pre_link_notes',
3245          'pre_user_description',
3246      );
3247  
3248      foreach ( $filters as $filter ) {
3249          add_filter( $filter, 'wp_targeted_link_rel' );
3250      };
3251  }
3252  
3253  /**
3254   * Removes all filters modifying the rel attribute of targeted links.
3255   *
3256   * @since 5.1.0
3257   */
3258  function wp_remove_targeted_link_rel_filters() {
3259      $filters = array(
3260          'title_save_pre',
3261          'content_save_pre',
3262          'excerpt_save_pre',
3263          'content_filtered_save_pre',
3264          'pre_comment_content',
3265          'pre_term_description',
3266          'pre_link_description',
3267          'pre_link_notes',
3268          'pre_user_description',
3269      );
3270  
3271      foreach ( $filters as $filter ) {
3272          remove_filter( $filter, 'wp_targeted_link_rel' );
3273      };
3274  }
3275  
3276  /**
3277   * Convert one smiley code to the icon graphic file equivalent.
3278   *
3279   * Callback handler for convert_smilies().
3280   *
3281   * Looks up one smiley code in the $wpsmiliestrans global array and returns an
3282   * `<img>` string for that smiley.
3283   *
3284   * @since 2.8.0
3285   *
3286   * @global array $wpsmiliestrans
3287   *
3288   * @param array $matches Single match. Smiley code to convert to image.
3289   * @return string Image string for smiley.
3290   */
3291  function translate_smiley( $matches ) {
3292      global $wpsmiliestrans;
3293  
3294      if ( count( $matches ) == 0 ) {
3295          return '';
3296      }
3297  
3298      $smiley = trim( reset( $matches ) );
3299      $img    = $wpsmiliestrans[ $smiley ];
3300  
3301      $matches    = array();
3302      $ext        = preg_match( '/\.([^.]+)$/', $img, $matches ) ? strtolower( $matches[1] ) : false;
3303      $image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );
3304  
3305      // Don't convert smilies that aren't images - they're probably emoji.
3306      if ( ! in_array( $ext, $image_exts ) ) {
3307          return $img;
3308      }
3309  
3310      /**
3311       * Filters the Smiley image URL before it's used in the image element.
3312       *
3313       * @since 2.9.0
3314       *
3315       * @param string $smiley_url URL for the smiley image.
3316       * @param string $img        Filename for the smiley image.
3317       * @param string $site_url   Site URL, as returned by site_url().
3318       */
3319      $src_url = apply_filters( 'smilies_src', includes_url( "images/smilies/$img" ), $img, site_url() );
3320  
3321      return sprintf( '<img src="%s" alt="%s" class="wp-smiley" style="height: 1em; max-height: 1em;" />', esc_url( $src_url ), esc_attr( $smiley ) );
3322  }
3323  
3324  /**
3325   * Convert text equivalent of smilies to images.
3326   *
3327   * Will only convert smilies if the option 'use_smilies' is true and the global
3328   * used in the function isn't empty.
3329   *
3330   * @since 0.71
3331   *
3332   * @global string|array $wp_smiliessearch
3333   *
3334   * @param string $text Content to convert smilies from text.
3335   * @return string Converted content with text smilies replaced with images.
3336   */
3337  function convert_smilies( $text ) {
3338      global $wp_smiliessearch;
3339      $output = '';
3340      if ( get_option( 'use_smilies' ) && ! empty( $wp_smiliessearch ) ) {
3341          // HTML loop taken from texturize function, could possible be consolidated
3342          $textarr = preg_split( '/(<.*>)/U', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // capture the tags as well as in between
3343          $stop    = count( $textarr );// loop stuff
3344  
3345          // Ignore proessing of specific tags
3346          $tags_to_ignore       = 'code|pre|style|script|textarea';
3347          $ignore_block_element = '';
3348  
3349          for ( $i = 0; $i < $stop; $i++ ) {
3350              $content = $textarr[ $i ];
3351  
3352              // If we're in an ignore block, wait until we find its closing tag
3353              if ( '' == $ignore_block_element && preg_match( '/^<(' . $tags_to_ignore . ')[^>]*>/', $content, $matches ) ) {
3354                  $ignore_block_element = $matches[1];
3355              }
3356  
3357              // If it's not a tag and not in ignore block
3358              if ( '' == $ignore_block_element && strlen( $content ) > 0 && '<' != $content[0] ) {
3359                  $content = preg_replace_callback( $wp_smiliessearch, 'translate_smiley', $content );
3360              }
3361  
3362              // did we exit ignore block
3363              if ( '' != $ignore_block_element && '</' . $ignore_block_element . '>' == $content ) {
3364                  $ignore_block_element = '';
3365              }
3366  
3367              $output .= $content;
3368          }
3369      } else {
3370          // return default text.
3371          $output = $text;
3372      }
3373      return $output;
3374  }
3375  
3376  /**
3377   * Verifies that an email is valid.
3378   *
3379   * Does not grok i18n domains. Not RFC compliant.
3380   *
3381   * @since 0.71
3382   *
3383   * @param string $email      Email address to verify.
3384   * @param bool   $deprecated Deprecated.
3385   * @return string|false Valid email address on success, false on failure.
3386   */
3387  function is_email( $email, $deprecated = false ) {
3388      if ( ! empty( $deprecated ) ) {
3389          _deprecated_argument( __FUNCTION__, '3.0.0' );
3390      }
3391  
3392      // Test for the minimum length the email can be
3393      if ( strlen( $email ) < 6 ) {
3394          /**
3395           * Filters whether an email address is valid.
3396           *
3397           * This filter is evaluated under several different contexts, such as 'email_too_short',
3398           * 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits',
3399           * 'domain_no_periods', 'sub_hyphen_limits', 'sub_invalid_chars', or no specific context.
3400           *
3401           * @since 2.8.0
3402           *
3403           * @param string|false $is_email The email address if successfully passed the is_email() checks, false otherwise.
3404           * @param string       $email    The email address being checked.
3405           * @param string       $context  Context under which the email was tested.
3406           */
3407          return apply_filters( 'is_email', false, $email, 'email_too_short' );
3408      }
3409  
3410      // Test for an @ character after the first position
3411      if ( strpos( $email, '@', 1 ) === false ) {
3412          /** This filter is documented in wp-includes/formatting.php */
3413          return apply_filters( 'is_email', false, $email, 'email_no_at' );
3414      }
3415  
3416      // Split out the local and domain parts
3417      list( $local, $domain ) = explode( '@', $email, 2 );
3418  
3419      // LOCAL PART
3420      // Test for invalid characters
3421      if ( ! preg_match( '/^[a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]+$/', $local ) ) {
3422          /** This filter is documented in wp-includes/formatting.php */
3423          return apply_filters( 'is_email', false, $email, 'local_invalid_chars' );
3424      }
3425  
3426      // DOMAIN PART
3427      // Test for sequences of periods
3428      if ( preg_match( '/\.{2,}/', $domain ) ) {
3429          /** This filter is documented in wp-includes/formatting.php */
3430          return apply_filters( 'is_email', false, $email, 'domain_period_sequence' );
3431      }
3432  
3433      // Test for leading and trailing periods and whitespace
3434      if ( trim( $domain, " \t\n\r\0\x0B." ) !== $domain ) {
3435          /** This filter is documented in wp-includes/formatting.php */
3436          return apply_filters( 'is_email', false, $email, 'domain_period_limits' );
3437      }
3438  
3439      // Split the domain into subs
3440      $subs = explode( '.', $domain );
3441  
3442      // Assume the domain will have at least two subs
3443      if ( 2 > count( $subs ) ) {
3444          /** This filter is documented in wp-includes/formatting.php */
3445          return apply_filters( 'is_email', false, $email, 'domain_no_periods' );
3446      }
3447  
3448      // Loop through each sub
3449      foreach ( $subs as $sub ) {
3450          // Test for leading and trailing hyphens and whitespace
3451          if ( trim( $sub, " \t\n\r\0\x0B-" ) !== $sub ) {
3452              /** This filter is documented in wp-includes/formatting.php */
3453              return apply_filters( 'is_email', false, $email, 'sub_hyphen_limits' );
3454          }
3455  
3456          // Test for invalid characters
3457          if ( ! preg_match( '/^[a-z0-9-]+$/i', $sub ) ) {
3458              /** This filter is documented in wp-includes/formatting.php */
3459              return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' );
3460          }
3461      }
3462  
3463      // Congratulations your email made it!
3464      /** This filter is documented in wp-includes/formatting.php */
3465      return apply_filters( 'is_email', $email, $email, null );
3466  }
3467  
3468  /**
3469   * Convert to ASCII from email subjects.
3470   *
3471   * @since 1.2.0
3472   *
3473   * @param string $string Subject line
3474   * @return string Converted string to ASCII
3475   */
3476  function wp_iso_descrambler( $string ) {
3477      /* this may only work with iso-8859-1, I'm afraid */
3478      if ( ! preg_match( '#\=\?(.+)\?Q\?(.+)\?\=#i', $string, $matches ) ) {
3479          return $string;
3480      } else {
3481          $subject = str_replace( '_', ' ', $matches[2] );
3482          return preg_replace_callback( '#\=([0-9a-f]{2})#i', '_wp_iso_convert', $subject );
3483      }
3484  }
3485  
3486  /**
3487   * Helper function to convert hex encoded chars to ASCII
3488   *
3489   * @since 3.1.0
3490   * @access private
3491   *
3492   * @param array $match The preg_replace_callback matches array
3493   * @return string Converted chars
3494   */
3495  function _wp_iso_convert( $match ) {
3496      return chr( hexdec( strtolower( $match[1] ) ) );
3497  }
3498  
3499  /**
3500   * Given a date in the timezone of the site, returns that date in UTC timezone.
3501   *
3502   * Requires and returns a date in the Y-m-d H:i:s format.
3503   * Return format can be overridden using the $format parameter.
3504   *
3505   * @since 1.2.0
3506   *
3507   * @param string $string The date to be converted, in the timezone of the site.
3508   * @param string $format The format string for the returned date. Default 'Y-m-d H:i:s'.
3509   * @return string Formatted version of the date, in UTC timezone.
3510   */
3511  function get_gmt_from_date( $string, $format = 'Y-m-d H:i:s' ) {
3512      $datetime = date_create( $string, wp_timezone() );
3513  
3514      if ( false === $datetime ) {
3515          return gmdate( $format, 0 );
3516      }
3517  
3518      return $datetime->setTimezone( new DateTimeZone( 'UTC' ) )->format( $format );
3519  }
3520  
3521  /**
3522   * Given a date in UTC timezone, returns that date in the timezone of the site.
3523   *
3524   * Requires and returns a date in the Y-m-d H:i:s format.
3525   * Return format can be overridden using the $format parameter.
3526   *
3527   * @since 1.2.0
3528   *
3529   * @param string $string The date to be converted, in UTC timezone.
3530   * @param string $format The format string for the returned date. Default 'Y-m-d H:i:s'.
3531   * @return string Formatted version of the date, in the site's timezone.
3532   */
3533  function get_date_from_gmt( $string, $format = 'Y-m-d H:i:s' ) {
3534      $datetime = date_create( $string, new DateTimeZone( 'UTC' ) );
3535  
3536      if ( false === $datetime ) {
3537          return gmdate( $format, 0 );
3538      }
3539  
3540      return $datetime->setTimezone( wp_timezone() )->format( $format );
3541  }
3542  
3543  /**
3544   * Computes an offset in seconds from an iso8601 timezone.
3545   *
3546   * @since 1.5.0
3547   *
3548   * @param string $timezone Either 'Z' for 0 offset or '±hhmm'.
3549   * @return int|float The offset in seconds.
3550   */
3551  function iso8601_timezone_to_offset( $timezone ) {
3552      // $timezone is either 'Z' or '[+|-]hhmm'
3553      if ( $timezone == 'Z' ) {
3554          $offset = 0;
3555      } else {
3556          $sign    = ( substr( $timezone, 0, 1 ) == '+' ) ? 1 : -1;
3557          $hours   = intval( substr( $timezone, 1, 2 ) );
3558          $minutes = intval( substr( $timezone, 3, 4 ) ) / 60;
3559          $offset  = $sign * HOUR_IN_SECONDS * ( $hours + $minutes );
3560      }
3561      return $offset;
3562  }
3563  
3564  /**
3565   * Converts an iso8601 (Ymd\TH:i:sO) date to MySQL DateTime (Y-m-d H:i:s) format used by post_date[_gmt].
3566   *
3567   * @since 1.5.0
3568   *
3569   * @param string $date_string Date and time in ISO 8601 format {@link https://en.wikipedia.org/wiki/ISO_8601}.
3570   * @param string $timezone    Optional. If set to 'gmt' returns the result in UTC. Default 'user'.
3571   * @return string|bool The date and time in MySQL DateTime format - Y-m-d H:i:s, or false on failure.
3572   */
3573  function iso8601_to_datetime( $date_string, $timezone = 'user' ) {
3574      $timezone    = strtolower( $timezone );
3575      $wp_timezone = wp_timezone();
3576      $datetime    = date_create( $date_string, $wp_timezone ); // Timezone is ignored if input has one.
3577  
3578      if ( false === $datetime ) {
3579          return false;
3580      }
3581  
3582      if ( 'gmt' === $timezone ) {
3583          return $datetime->setTimezone( new DateTimeZone( 'UTC' ) )->format( 'Y-m-d H:i:s' );
3584      }
3585  
3586      if ( 'user' === $timezone ) {
3587          return $datetime->setTimezone( $wp_timezone )->format( 'Y-m-d H:i:s' );
3588      }
3589  
3590      return false;
3591  }
3592  
3593  /**
3594   * Strips out all characters that are not allowable in an email.
3595   *
3596   * @since 1.5.0
3597   *
3598   * @param string $email Email address to filter.
3599   * @return string Filtered email address.
3600   */
3601  function sanitize_email( $email ) {
3602      // Test for the minimum length the email can be
3603      if ( strlen( $email ) < 6 ) {
3604          /**
3605           * Filters a sanitized email address.
3606           *
3607           * This filter is evaluated under several contexts, including 'email_too_short',
3608           * 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits',
3609           * 'domain_no_periods', 'domain_no_valid_subs', or no context.
3610           *
3611           * @since 2.8.0
3612           *
3613           * @param string $sanitized_email The sanitized email address.
3614           * @param string $email           The email address, as provided to sanitize_email().
3615           * @param string|null $message    A message to pass to the user. null if email is sanitized.
3616           */
3617          return apply_filters( 'sanitize_email', '', $email, 'email_too_short' );
3618      }
3619  
3620      // Test for an @ character after the first position
3621      if ( strpos( $email, '@', 1 ) === false ) {
3622          /** This filter is documented in wp-includes/formatting.php */
3623          return apply_filters( 'sanitize_email', '', $email, 'email_no_at' );
3624      }
3625  
3626      // Split out the local and domain parts
3627      list( $local, $domain ) = explode( '@', $email, 2 );
3628  
3629      // LOCAL PART
3630      // Test for invalid characters
3631      $local = preg_replace( '/[^a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]/', '', $local );
3632      if ( '' === $local ) {
3633          /** This filter is documented in wp-includes/formatting.php */
3634          return apply_filters( 'sanitize_email', '', $email, 'local_invalid_chars' );
3635      }
3636  
3637      // DOMAIN PART
3638      // Test for sequences of periods
3639      $domain = preg_replace( '/\.{2,}/', '', $domain );
3640      if ( '' === $domain ) {
3641          /** This filter is documented in wp-includes/formatting.php */
3642          return apply_filters( 'sanitize_email', '', $email, 'domain_period_sequence' );
3643      }
3644  
3645      // Test for leading and trailing periods and whitespace
3646      $domain = trim( $domain, " \t\n\r\0\x0B." );
3647      if ( '' === $domain ) {
3648          /** This filter is documented in wp-includes/formatting.php */
3649          return apply_filters( 'sanitize_email', '', $email, 'domain_period_limits' );
3650      }
3651  
3652      // Split the domain into subs
3653      $subs = explode( '.', $domain );
3654  
3655      // Assume the domain will have at least two subs
3656      if ( 2 > count( $subs ) ) {
3657          /** This filter is documented in wp-includes/formatting.php */
3658          return apply_filters( 'sanitize_email', '', $email, 'domain_no_periods' );
3659      }
3660  
3661      // Create an array that will contain valid subs
3662      $new_subs = array();
3663  
3664      // Loop through each sub
3665      foreach ( $subs as $sub ) {
3666          // Test for leading and trailing hyphens
3667          $sub = trim( $sub, " \t\n\r\0\x0B-" );
3668  
3669          // Test for invalid characters
3670          $sub = preg_replace( '/[^a-z0-9-]+/i', '', $sub );
3671  
3672          // If there's anything left, add it to the valid subs
3673          if ( '' !== $sub ) {
3674              $new_subs[] = $sub;
3675          }
3676      }
3677  
3678      // If there aren't 2 or more valid subs
3679      if ( 2 > count( $new_subs ) ) {
3680          /** This filter is documented in wp-includes/formatting.php */
3681          return apply_filters( 'sanitize_email', '', $email, 'domain_no_valid_subs' );
3682      }
3683  
3684      // Join valid subs into the new domain
3685      $domain = join( '.', $new_subs );
3686  
3687      // Put the email back together
3688      $sanitized_email = $local . '@' . $domain;
3689  
3690      // Congratulations your email made it!
3691      /** This filter is documented in wp-includes/formatting.php */
3692      return apply_filters( 'sanitize_email', $sanitized_email, $email, null );
3693  }
3694  
3695  /**
3696   * Determines the difference between two timestamps.
3697   *
3698   * The difference is returned in a human readable format such as "1 hour",
3699   * "5 mins", "2 days".
3700   *
3701   * @since 1.5.0
3702   * @since 5.3.0 Added support for showing a difference in seconds.
3703   *
3704   * @param int $from Unix timestamp from which the difference begins.
3705   * @param int $to   Optional. Unix timestamp to end the time difference. Default becomes time() if not set.
3706   * @return string Human readable time difference.
3707   */
3708  function human_time_diff( $from, $to = 0 ) {
3709      if ( empty( $to ) ) {
3710          $to = time();
3711      }
3712  
3713      $diff = (int) abs( $to - $from );
3714  
3715      if ( $diff < MINUTE_IN_SECONDS ) {
3716          $secs = $diff;
3717          if ( $secs <= 1 ) {
3718              $secs = 1;
3719          }
3720          /* translators: Time difference between two dates, in seconds. %s: Number of seconds. */
3721          $since = sprintf( _n( '%s second', '%s seconds', $secs ), $secs );
3722      } elseif ( $diff < HOUR_IN_SECONDS && $diff >= MINUTE_IN_SECONDS ) {
3723          $mins = round( $diff / MINUTE_IN_SECONDS );
3724          if ( $mins <= 1 ) {
3725              $mins = 1;
3726          }
3727          /* translators: Time difference between two dates, in minutes (min=minute). %s: Number of minutes. */
3728          $since = sprintf( _n( '%s min', '%s mins', $mins ), $mins );
3729      } elseif ( $diff < DAY_IN_SECONDS && $diff >= HOUR_IN_SECONDS ) {
3730          $hours = round( $diff / HOUR_IN_SECONDS );
3731          if ( $hours <= 1 ) {
3732              $hours = 1;
3733          }
3734          /* translators: Time difference between two dates, in hours. %s: Number of hours. */
3735          $since = sprintf( _n( '%s hour', '%s hours', $hours ), $hours );
3736      } elseif ( $diff < WEEK_IN_SECONDS && $diff >= DAY_IN_SECONDS ) {
3737          $days = round( $diff / DAY_IN_SECONDS );
3738          if ( $days <= 1 ) {
3739              $days = 1;
3740          }
3741          /* translators: Time difference between two dates, in days. %s: Number of days. */
3742          $since = sprintf( _n( '%s day', '%s days', $days ), $days );
3743      } elseif ( $diff < MONTH_IN_SECONDS && $diff >= WEEK_IN_SECONDS ) {
3744          $weeks = round( $diff / WEEK_IN_SECONDS );
3745          if ( $weeks <= 1 ) {
3746              $weeks = 1;
3747          }
3748          /* translators: Time difference between two dates, in weeks. %s: Number of weeks. */
3749          $since = sprintf( _n( '%s week', '%s weeks', $weeks ), $weeks );
3750      } elseif ( $diff < YEAR_IN_SECONDS && $diff >= MONTH_IN_SECONDS ) {
3751          $months = round( $diff / MONTH_IN_SECONDS );
3752          if ( $months <= 1 ) {
3753              $months = 1;
3754          }
3755          /* translators: Time difference between two dates, in months. %s: Number of months. */
3756          $since = sprintf( _n( '%s month', '%s months', $months ), $months );
3757      } elseif ( $diff >= YEAR_IN_SECONDS ) {
3758          $years = round( $diff / YEAR_IN_SECONDS );
3759          if ( $years <= 1 ) {
3760              $years = 1;
3761          }
3762          /* translators: Time difference between two dates, in years. %s: Number of years. */
3763          $since = sprintf( _n( '%s year', '%s years', $years ), $years );
3764      }
3765  
3766      /**
3767       * Filters the human readable difference between two timestamps.
3768       *
3769       * @since 4.0.0
3770       *
3771       * @param string $since The difference in human readable text.
3772       * @param int    $diff  The difference in seconds.
3773       * @param int    $from  Unix timestamp from which the difference begins.
3774       * @param int    $to    Unix timestamp to end the time difference.
3775       */
3776      return apply_filters( 'human_time_diff', $since, $diff, $from, $to );
3777  }
3778  
3779  /**
3780   * Generates an excerpt from the content, if needed.
3781   *
3782   * Returns a maximum of 55 words with an ellipsis appended if necessary.
3783   *
3784   * The 55 word limit can be modified by plugins/themes using the {@see 'excerpt_length'} filter
3785   * The ' [&hellip;]' string can be modified by plugins/themes using the {@see 'excerpt_more'} filter
3786   *
3787   * @since 1.5.0
3788   * @since 5.2.0 Added the `$post` parameter.
3789   *
3790   * @param string             $text Optional. The excerpt. If set to empty, an excerpt is generated.
3791   * @param WP_Post|object|int $post Optional. WP_Post instance or Post ID/object. Default is null.
3792   * @return string The excerpt.
3793   */
3794  function wp_trim_excerpt( $text = '', $post = null ) {
3795      $raw_excerpt = $text;
3796      if ( '' == $text ) {
3797          $post = get_post( $post );
3798          $text = get_the_content( '', false, $post );
3799  
3800          $text = strip_shortcodes( $text );
3801          $text = excerpt_remove_blocks( $text );
3802  
3803          /** This filter is documented in wp-includes/post-template.php */
3804          $text = apply_filters( 'the_content', $text );
3805          $text = str_replace( ']]>', ']]&gt;', $text );
3806  
3807          /* translators: Maximum number of words used in a post excerpt. */
3808          $excerpt_length = intval( _x( '55', 'excerpt_length' ) );
3809  
3810          /**
3811           * Filters the maximum number of words in a post excerpt.
3812           *
3813           * @since 2.7.0
3814           *
3815           * @param int $number The maximum number of words. Default 55.
3816           */
3817          $excerpt_length = (int) apply_filters( 'excerpt_length', $excerpt_length );
3818  
3819          /**
3820           * Filters the string in the "more" link displayed after a trimmed excerpt.
3821           *
3822           * @since 2.9.0
3823           *
3824           * @param string $more_string The string shown within the more link.
3825           */
3826          $excerpt_more = apply_filters( 'excerpt_more', ' ' . '[&hellip;]' );
3827          $text         = wp_trim_words( $text, $excerpt_length, $excerpt_more );
3828      }
3829  
3830      /**
3831       * Filters the trimmed excerpt string.
3832       *
3833       * @since 2.8.0
3834       *
3835       * @param string $text        The trimmed text.
3836       * @param string $raw_excerpt The text prior to trimming.
3837       */
3838      return apply_filters( 'wp_trim_excerpt', $text, $raw_excerpt );
3839  }
3840  
3841  /**
3842   * Trims text to a certain number of words.
3843   *
3844   * This function is localized. For languages that count 'words' by the individual
3845   * character (such as East Asian languages), the $num_words argument will apply
3846   * to the number of individual characters.
3847   *
3848   * @since 3.3.0
3849   *
3850   * @param string $text      Text to trim.
3851   * @param int    $num_words Number of words. Default 55.
3852   * @param string $more      Optional. What to append if $text needs to be trimmed. Default '&hellip;'.
3853   * @return string Trimmed text.
3854   */
3855  function wp_trim_words( $text, $num_words = 55, $more = null ) {
3856      if ( null === $more ) {
3857          $more = __( '&hellip;' );
3858      }
3859  
3860      $original_text = $text;
3861      $text          = wp_strip_all_tags( $text );
3862      $num_words     = (int) $num_words;
3863  
3864      /*
3865       * translators: If your word count is based on single characters (e.g. East Asian characters),
3866       * enter 'characters_excluding_spaces' or 'characters_including_spaces'. Otherwise, enter 'words'.
3867       * Do not translate into your own language.
3868       */
3869      if ( strpos( _x( 'words', 'Word count type. Do not translate!' ), 'characters' ) === 0 && preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) {
3870          $text = trim( preg_replace( "/[\n\r\t ]+/", ' ', $text ), ' ' );
3871          preg_match_all( '/./u', $text, $words_array );
3872          $words_array = array_slice( $words_array[0], 0, $num_words + 1 );
3873          $sep         = '';
3874      } else {
3875          $words_array = preg_split( "/[\n\r\t ]+/", $text, $num_words + 1, PREG_SPLIT_NO_EMPTY );
3876          $sep         = ' ';
3877      }
3878  
3879      if ( count( $words_array ) > $num_words ) {
3880          array_pop( $words_array );
3881          $text = implode( $sep, $words_array );
3882          $text = $text . $more;
3883      } else {
3884          $text = implode( $sep, $words_array );
3885      }
3886  
3887      /**
3888       * Filters the text content after words have been trimmed.
3889       *
3890       * @since 3.3.0
3891       *
3892       * @param string $text          The trimmed text.
3893       * @param int    $num_words     The number of words to trim the text to. Default 55.
3894       * @param string $more          An optional string to append to the end of the trimmed text, e.g. &hellip;.
3895       * @param string $original_text The text before it was trimmed.
3896       */
3897      return apply_filters( 'wp_trim_words', $text, $num_words, $more, $original_text );
3898  }
3899  
3900  /**
3901   * Converts named entities into numbered entities.
3902   *
3903   * @since 1.5.1
3904   *
3905   * @param string $text The text within which entities will be converted.
3906   * @return string Text with converted entities.
3907   */
3908  function ent2ncr( $text ) {
3909  
3910      /**
3911       * Filters text before named entities are converted into numbered entities.
3912       *
3913       * A non-null string must be returned for the filter to be evaluated.
3914       *
3915       * @since 3.3.0
3916       *
3917       * @param string|null $converted_text The text to be converted. Default null.
3918       * @param string      $text           The text prior to entity conversion.
3919       */
3920      $filtered = apply_filters( 'pre_ent2ncr', null, $text );
3921      if ( null !== $filtered ) {
3922          return $filtered;
3923      }
3924  
3925      $to_ncr = array(
3926          '&quot;'     => '&#34;',
3927          '&amp;'      => '&#38;',
3928          '&lt;'       => '&#60;',
3929          '&gt;'       => '&#62;',
3930          '|'          => '&#124;',
3931          '&nbsp;'     => '&#160;',
3932          '&iexcl;'    => '&#161;',
3933          '&cent;'     => '&#162;',
3934          '&pound;'    => '&#163;',
3935          '&curren;'   => '&#164;',
3936          '&yen;'      => '&#165;',
3937          '&brvbar;'   => '&#166;',
3938          '&brkbar;'   => '&#166;',
3939          '&sect;'     => '&#167;',
3940          '&uml;'      => '&#168;',
3941          '&die;'      => '&#168;',
3942          '&copy;'     => '&#169;',
3943          '&ordf;'     => '&#170;',
3944          '&laquo;'    => '&#171;',
3945          '&not;'      => '&#172;',
3946          '&shy;'      => '&#173;',
3947          '&reg;'      => '&#174;',
3948          '&macr;'     => '&#175;',
3949          '&hibar;'    => '&#175;',
3950          '&deg;'      => '&#176;',
3951          '&plusmn;'   => '&#177;',
3952          '&sup2;'     => '&#178;',
3953          '&sup3;'     => '&#179;',
3954          '&acute;'    => '&#180;',
3955          '&micro;'    => '&#181;',
3956          '&para;'     => '&#182;',
3957          '&middot;'   => '&#183;',
3958          '&cedil;'    => '&#184;',
3959          '&sup1;'     => '&#185;',
3960          '&ordm;'     => '&#186;',
3961          '&raquo;'    => '&#187;',
3962          '&frac14;'   => '&#188;',
3963          '&frac12;'   => '&#189;',
3964          '&frac34;'   => '&#190;',
3965          '&iquest;'   => '&#191;',
3966          '&Agrave;'   => '&#192;',
3967          '&Aacute;'   => '&#193;',
3968          '&Acirc;'    => '&#194;',
3969          '&Atilde;'   => '&#195;',
3970          '&Auml;'     => '&#196;',
3971          '&Aring;'    => '&#197;',
3972          '&AElig;'    => '&#198;',
3973          '&Ccedil;'   => '&#199;',
3974          '&Egrave;'   => '&#200;',
3975          '&Eacute;'   => '&#201;',
3976          '&Ecirc;'    => '&#202;',
3977          '&Euml;'     => '&#203;',
3978          '&Igrave;'   => '&#204;',
3979          '&Iacute;'   => '&#205;',
3980          '&Icirc;'    => '&#206;',
3981          '&Iuml;'     => '&#207;',
3982          '&ETH;'      => '&#208;',
3983          '&Ntilde;'   => '&#209;',
3984          '&Ograve;'   => '&#210;',
3985          '&Oacute;'   => '&#211;',
3986          '&Ocirc;'    => '&#212;',
3987          '&Otilde;'   => '&#213;',
3988          '&Ouml;'     => '&#214;',
3989          '&times;'    => '&#215;',
3990          '&Oslash;'   => '&#216;',
3991          '&Ugrave;'   => '&#217;',
3992          '&Uacute;'   => '&#218;',
3993          '&Ucirc;'    => '&#219;',
3994          '&Uuml;'     => '&#220;',
3995          '&Yacute;'   => '&#221;',
3996          '&THORN;'    => '&#222;',
3997          '&szlig;'    => '&#223;',
3998          '&agrave;'   => '&#224;',
3999          '&aacute;'   => '&#225;',
4000          '&acirc;'    => '&#226;',
4001          '&atilde;'   => '&#227;',
4002          '&auml;'     => '&#228;',
4003          '&aring;'    => '&#229;',
4004          '&aelig;'    => '&#230;',
4005          '&ccedil;'   => '&#231;',
4006          '&egrave;'   => '&#232;',
4007          '&eacute;'   => '&#233;',
4008          '&ecirc;'    => '&#234;',
4009          '&euml;'     => '&#235;',
4010          '&igrave;'   => '&#236;',
4011          '&iacute;'   => '&#237;',
4012          '&icirc;'    => '&#238;',
4013          '&iuml;'     => '&#239;',
4014          '&eth;'      => '&#240;',
4015          '&ntilde;'   => '&#241;',
4016          '&ograve;'   => '&#242;',
4017          '&oacute;'   => '&#243;',
4018          '&ocirc;'    => '&#244;',
4019          '&otilde;'   => '&#245;',
4020          '&ouml;'     => '&#246;',
4021          '&divide;'   => '&#247;',
4022          '&oslash;'   => '&#248;',
4023          '&ugrave;'   => '&#249;',
4024          '&uacute;'   => '&#250;',
4025          '&ucirc;'    => '&#251;',
4026          '&uuml;'     => '&#252;',
4027          '&yacute;'   => '&#253;',
4028          '&thorn;'    => '&#254;',
4029          '&yuml;'     => '&#255;',
4030          '&OElig;'    => '&#338;',
4031          '&oelig;'    => '&#339;',
4032          '&Scaron;'   => '&#352;',
4033          '&scaron;'   => '&#353;',
4034          '&Yuml;'     => '&#376;',
4035          '&fnof;'     => '&#402;',
4036          '&circ;'     => '&#710;',
4037          '&tilde;'    => '&#732;',
4038          '&Alpha;'    => '&#913;',
4039          '&Beta;'     => '&#914;',
4040          '&Gamma;'    => '&#915;',
4041          '&Delta;'    => '&#916;',
4042          '&Epsilon;'  => '&#917;',
4043          '&Zeta;'     => '&#918;',
4044          '&Eta;'      => '&#919;',
4045          '&Theta;'    => '&#920;',
4046          '&Iota;'     => '&#921;',
4047          '&Kappa;'    => '&#922;',
4048          '&Lambda;'   => '&#923;',
4049          '&Mu;'       => '&#924;',
4050          '&Nu;'       => '&#925;',
4051          '&Xi;'       => '&#926;',
4052          '&Omicron;'  => '&#927;',
4053          '&Pi;'       => '&#928;',
4054          '&Rho;'      => '&#929;',
4055          '&Sigma;'    => '&#931;',
4056          '&Tau;'      => '&#932;',
4057          '&Upsilon;'  => '&#933;',
4058          '&Phi;'      => '&#934;',
4059          '&Chi;'      => '&#935;',
4060          '&Psi;'      => '&#936;',
4061          '&Omega;'    => '&#937;',
4062          '&alpha;'    => '&#945;',
4063          '&beta;'     => '&#946;',
4064          '&gamma;'    => '&#947;',
4065          '&delta;'    => '&#948;',
4066          '&epsilon;'  => '&#949;',
4067          '&zeta;'     => '&#950;',
4068          '&eta;'      => '&#951;',
4069          '&theta;'    => '&#952;',
4070          '&iota;'     => '&#953;',
4071          '&kappa;'    => '&#954;',
4072          '&lambda;'   => '&#955;',
4073          '&mu;'       => '&#956;',
4074          '&nu;'       => '&#957;',
4075          '&xi;'       => '&#958;',
4076          '&omicron;'  => '&#959;',
4077          '&pi;'       => '&#960;',
4078          '&rho;'      => '&#961;',
4079          '&sigmaf;'   => '&#962;',
4080          '&sigma;'    => '&#963;',
4081          '&tau;'      => '&#964;',
4082          '&upsilon;'  => '&#965;',
4083          '&phi;'      => '&#966;',
4084          '&chi;'      => '&#967;',
4085          '&psi;'      => '&#968;',
4086          '&omega;'    => '&#969;',
4087          '&thetasym;' => '&#977;',
4088          '&upsih;'    => '&#978;',
4089          '&piv;'      => '&#982;',
4090          '&ensp;'     => '&#8194;',
4091          '&emsp;'     => '&#8195;',
4092          '&thinsp;'   => '&#8201;',
4093          '&zwnj;'     => '&#8204;',
4094          '&zwj;'      => '&#8205;',
4095          '&lrm;'      => '&#8206;',
4096          '&rlm;'      => '&#8207;',
4097          '&ndash;'    => '&#8211;',
4098          '&mdash;'    => '&#8212;',
4099          '&lsquo;'    => '&#8216;',
4100          '&rsquo;'    => '&#8217;',
4101          '&sbquo;'    => '&#8218;',
4102          '&ldquo;'    => '&#8220;',
4103          '&rdquo;'    => '&#8221;',
4104          '&bdquo;'    => '&#8222;',
4105          '&dagger;'   => '&#8224;',
4106          '&Dagger;'   => '&#8225;',
4107          '&bull;'     => '&#8226;',
4108          '&hellip;'   => '&#8230;',
4109          '&permil;'   => '&#8240;',
4110          '&prime;'    => '&#8242;',
4111          '&Prime;'    => '&#8243;',
4112          '&lsaquo;'   => '&#8249;',
4113          '&rsaquo;'   => '&#8250;',
4114          '&oline;'    => '&#8254;',
4115          '&frasl;'    => '&#8260;',
4116          '&euro;'     => '&#8364;',
4117          '&image;'    => '&#8465;',
4118          '&weierp;'   => '&#8472;',
4119          '&real;'     => '&#8476;',
4120          '&trade;'    => '&#8482;',
4121          '&alefsym;'  => '&#8501;',
4122          '&crarr;'    => '&#8629;',
4123          '&lArr;'     => '&#8656;',
4124          '&uArr;'     => '&#8657;',
4125          '&rArr;'     => '&#8658;',
4126          '&dArr;'     => '&#8659;',
4127          '&hArr;'     => '&#8660;',
4128          '&forall;'   => '&#8704;',
4129          '&part;'     => '&#8706;',
4130          '&exist;'    => '&#8707;',
4131          '&empty;'    => '&#8709;',
4132          '&nabla;'    => '&#8711;',
4133          '&isin;'     => '&#8712;',
4134          '&notin;'    => '&#8713;',
4135          '&ni;'       => '&#8715;',
4136          '&prod;'     => '&#8719;',
4137          '&sum;'      => '&#8721;',
4138          '&minus;'    => '&#8722;',
4139          '&lowast;'   => '&#8727;',
4140          '&radic;'    => '&#8730;',
4141          '&prop;'     => '&#8733;',
4142          '&infin;'    => '&#8734;',
4143          '&ang;'      => '&#8736;',
4144          '&and;'      => '&#8743;',
4145          '&or;'       => '&#8744;',
4146          '&cap;'      => '&#8745;',
4147          '&cup;'      => '&#8746;',
4148          '&int;'      => '&#8747;',
4149          '&there4;'   => '&#8756;',
4150          '&sim;'      => '&#8764;',
4151          '&cong;'     => '&#8773;',
4152          '&asymp;'    => '&#8776;',
4153          '&ne;'       => '&#8800;',
4154          '&equiv;'    => '&#8801;',
4155          '&le;'       => '&#8804;',
4156          '&ge;'       => '&#8805;',
4157          '&sub;'      => '&#8834;',
4158          '&sup;'      => '&#8835;',
4159          '&nsub;'     => '&#8836;',
4160          '&sube;'     => '&#8838;',
4161          '&supe;'     => '&#8839;',
4162          '&oplus;'    => '&#8853;',
4163          '&otimes;'   => '&#8855;',
4164          '&perp;'     => '&#8869;',
4165          '&sdot;'     => '&#8901;',
4166          '&lceil;'    => '&#8968;',
4167          '&rceil;'    => '&#8969;',
4168          '&lfloor;'   => '&#8970;',
4169          '&rfloor;'   => '&#8971;',
4170          '&lang;'     => '&#9001;',
4171          '&rang;'     => '&#9002;',
4172          '&larr;'     => '&#8592;',
4173          '&uarr;'     => '&#8593;',
4174          '&rarr;'     => '&#8594;',
4175          '&darr;'     => '&#8595;',
4176          '&harr;'     => '&#8596;',
4177          '&loz;'      => '&#9674;',
4178          '&spades;'   => '&#9824;',
4179          '&clubs;'    => '&#9827;',
4180          '&hearts;'   => '&#9829;',
4181          '&diams;'    => '&#9830;',
4182      );
4183  
4184      return str_replace( array_keys( $to_ncr ), array_values( $to_ncr ), $text );
4185  }
4186  
4187  /**
4188   * Formats text for the editor.
4189   *
4190   * Generally the browsers treat everything inside a textarea as text, but
4191   * it is still a good idea to HTML entity encode `<`, `>` and `&` in the content.
4192   *
4193   * The filter {@see 'format_for_editor'} is applied here. If `$text` is empty the
4194   * filter will be applied to an empty string.
4195   *
4196   * @since 4.3.0
4197   *
4198   * @see _WP_Editors::editor()
4199   *
4200   * @param string $text           The text to be formatted.
4201   * @param string $default_editor The default editor for the current user.
4202   *                               It is usually either 'html' or 'tinymce'.
4203   * @return string The formatted text after filter is applied.
4204   */
4205  function format_for_editor( $text, $default_editor = null ) {
4206      if ( $text ) {
4207          $text = htmlspecialchars( $text, ENT_NOQUOTES, get_option( 'blog_charset' ) );
4208      }
4209  
4210      /**
4211       * Filters the text after it is formatted for the editor.
4212       *
4213       * @since 4.3.0
4214       *
4215       * @param string $text           The formatted text.
4216       * @param string $default_editor The default editor for the current user.
4217       *                               It is usually either 'html' or 'tinymce'.
4218       */
4219      return apply_filters( 'format_for_editor', $text, $default_editor );
4220  }
4221  
4222  /**
4223   * Perform a deep string replace operation to ensure the values in $search are no longer present
4224   *
4225   * Repeats the replacement operation until it no longer replaces anything so as to remove "nested" values
4226   * e.g. $subject = '%0%0%0DDD', $search ='%0D', $result ='' rather than the '%0%0DD' that
4227   * str_replace would return
4228   *
4229   * @since 2.8.1
4230   * @access private
4231   *
4232   * @param string|array $search  The value being searched for, otherwise known as the needle.
4233   *                              An array may be used to designate multiple needles.
4234   * @param string       $subject The string being searched and replaced on, otherwise known as the haystack.
4235   * @return string The string with the replaced values.
4236   */
4237  function _deep_replace( $search, $subject ) {
4238      $subject = (string) $subject;
4239  
4240      $count = 1;
4241      while ( $count ) {
4242          $subject = str_replace( $search, '', $subject, $count );
4243      }
4244  
4245      return $subject;
4246  }
4247  
4248  /**
4249   * Escapes data for use in a MySQL query.
4250   *
4251   * Usually you should prepare queries using wpdb::prepare().
4252   * Sometimes, spot-escaping is required or useful. One example
4253   * is preparing an array for use in an IN clause.
4254   *
4255   * NOTE: Since 4.8.3, '%' characters will be replaced with a placeholder string,
4256   * this prevents certain SQLi attacks from taking place. This change in behaviour
4257   * may cause issues for code that expects the return value of esc_sql() to be useable
4258   * for other purposes.
4259   *
4260   * @since 2.8.0
4261   *
4262   * @global wpdb $wpdb WordPress database abstraction object.
4263   *
4264   * @param string|array $data Unescaped data
4265   * @return string|array Escaped data
4266   */
4267  function esc_sql( $data ) {
4268      global $wpdb;
4269      return $wpdb->_escape( $data );
4270  }
4271  
4272  /**
4273   * Checks and cleans a URL.
4274   *
4275   * A number of characters are removed from the URL. If the URL is for displaying
4276   * (the default behaviour) ampersands are also replaced. The {@see 'clean_url'} filter
4277   * is applied to the returned cleaned URL.
4278   *
4279   * @since 2.8.0
4280   *
4281   * @param string   $url       The URL to be cleaned.
4282   * @param string[] $protocols Optional. An array of acceptable protocols.
4283   *                            Defaults to return value of wp_allowed_protocols()
4284   * @param string   $_context  Private. Use esc_url_raw() for database usage.
4285   * @return string The cleaned $url after the {@see 'clean_url'} filter is applied.
4286   */
4287  function esc_url( $url, $protocols = null, $_context = 'display' ) {
4288      $original_url = $url;
4289  
4290      if ( '' == $url ) {
4291          return $url;
4292      }
4293  
4294      $url = str_replace( ' ', '%20', ltrim( $url ) );
4295      $url = preg_replace( '|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\[\]\\x80-\\xff]|i', '', $url );
4296  
4297      if ( '' === $url ) {
4298          return $url;
4299      }
4300  
4301      if ( 0 !== stripos( $url, 'mailto:' ) ) {
4302          $strip = array( '%0d', '%0a', '%0D', '%0A' );
4303          $url   = _deep_replace( $strip, $url );
4304      }
4305  
4306      $url = str_replace( ';//', '://', $url );
4307      /* If the URL doesn't appear to contain a scheme, we
4308       * presume it needs http:// prepended (unless a relative
4309       * link starting with /, # or ? or a php file).
4310       */
4311      if ( strpos( $url, ':' ) === false && ! in_array( $url[0], array( '/', '#', '?' ) ) &&
4312          ! preg_match( '/^[a-z0-9-]+?\.php/i', $url ) ) {
4313          $url = 'http://' . $url;
4314      }
4315  
4316      // Replace ampersands and single quotes only when displaying.
4317      if ( 'display' == $_context ) {
4318          $url = wp_kses_normalize_entities( $url );
4319          $url = str_replace( '&amp;', '&#038;', $url );
4320          $url = str_replace( "'", '&#039;', $url );
4321      }
4322  
4323      if ( ( false !== strpos( $url, '[' ) ) || ( false !== strpos( $url, ']' ) ) ) {
4324  
4325          $parsed = wp_parse_url( $url );
4326          $front  = '';
4327  
4328          if ( isset( $parsed['scheme'] ) ) {
4329              $front .= $parsed['scheme'] . '://';
4330          } elseif ( '/' === $url[0] ) {
4331              $front .= '//';
4332          }
4333  
4334          if ( isset( $parsed['user'] ) ) {
4335              $front .= $parsed['user'];
4336          }
4337  
4338          if ( isset( $parsed['pass'] ) ) {
4339              $front .= ':' . $parsed['pass'];
4340          }
4341  
4342          if ( isset( $parsed['user'] ) || isset( $parsed['pass'] ) ) {
4343              $front .= '@';
4344          }
4345  
4346          if ( isset( $parsed['host'] ) ) {
4347              $front .= $parsed['host'];
4348          }
4349  
4350          if ( isset( $parsed['port'] ) ) {
4351              $front .= ':' . $parsed['port'];
4352          }
4353  
4354          $end_dirty = str_replace( $front, '', $url );
4355          $end_clean = str_replace( array( '[', ']' ), array( '%5B', '%5D' ), $end_dirty );
4356          $url       = str_replace( $end_dirty, $end_clean, $url );
4357  
4358      }
4359  
4360      if ( '/' === $url[0] ) {
4361          $good_protocol_url = $url;
4362      } else {
4363          if ( ! is_array( $protocols ) ) {
4364              $protocols = wp_allowed_protocols();
4365          }
4366          $good_protocol_url = wp_kses_bad_protocol( $url, $protocols );
4367          if ( strtolower( $good_protocol_url ) != strtolower( $url ) ) {
4368              return '';
4369          }
4370      }
4371  
4372      /**
4373       * Filters a string cleaned and escaped for output as a URL.
4374       *
4375       * @since 2.3.0
4376       *
4377       * @param string $good_protocol_url The cleaned URL to be returned.
4378       * @param string $original_url      The URL prior to cleaning.
4379       * @param string $_context          If 'display', replace ampersands and single quotes only.
4380       */
4381      return apply_filters( 'clean_url', $good_protocol_url, $original_url, $_context );
4382  }
4383  
4384  /**
4385   * Performs esc_url() for database usage.
4386   *
4387   * @since 2.8.0
4388   *
4389   * @param string   $url       The URL to be cleaned.
4390   * @param string[] $protocols An array of acceptable protocols.
4391   * @return string The cleaned URL.
4392   */
4393  function esc_url_raw( $url, $protocols = null ) {
4394      return esc_url( $url, $protocols, 'db' );
4395  }
4396  
4397  /**
4398   * Convert entities, while preserving already-encoded entities.
4399   *
4400   * @link https://www.php.net/htmlentities Borrowed from the PHP Manual user notes.
4401   *
4402   * @since 1.2.2
4403   *
4404   * @param string $myHTML The text to be converted.
4405   * @return string Converted text.
4406   */
4407  function htmlentities2( $myHTML ) {
4408      $translation_table              = get_html_translation_table( HTML_ENTITIES, ENT_QUOTES );
4409      $translation_table[ chr( 38 ) ] = '&';
4410      return preg_replace( '/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,3};)/', '&amp;', strtr( $myHTML, $translation_table ) );
4411  }
4412  
4413  /**
4414   * Escape single quotes, htmlspecialchar " < > &, and fix line endings.
4415   *
4416   * Escapes text strings for echoing in JS. It is intended to be used for inline JS
4417   * (in a tag attribute, for example onclick="..."). Note that the strings have to
4418   * be in single quotes. The {@see 'js_escape'} filter is also applied here.
4419   *
4420   * @since 2.8.0
4421   *
4422   * @param string $text The text to be escaped.
4423   * @return string Escaped text.
4424   */
4425  function esc_js( $text ) {
4426      $safe_text = wp_check_invalid_utf8( $text );
4427      $safe_text = _wp_specialchars( $safe_text, ENT_COMPAT );
4428      $safe_text = preg_replace( '/&#(x)?0*(?(1)27|39);?/i', "'", stripslashes( $safe_text ) );
4429      $safe_text = str_replace( "\r", '', $safe_text );
4430      $safe_text = str_replace( "\n", '\\n', addslashes( $safe_text ) );
4431      /**
4432       * Filters a string cleaned and escaped for output in JavaScript.
4433       *
4434       * Text passed to esc_js() is stripped of invalid or special characters,
4435       * and properly slashed for output.
4436       *
4437       * @since 2.0.6
4438       *
4439       * @param string $safe_text The text after it has been escaped.
4440       * @param string $text      The text prior to being escaped.
4441       */
4442      return apply_filters( 'js_escape', $safe_text, $text );
4443  }
4444  
4445  /**
4446   * Escaping for HTML blocks.
4447   *
4448   * @since 2.8.0
4449   *
4450   * @param string $text
4451   * @return string
4452   */
4453  function esc_html( $text ) {
4454      $safe_text = wp_check_invalid_utf8( $text );
4455      $safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );
4456      /**
4457       * Filters a string cleaned and escaped for output in HTML.
4458       *
4459       * Text passed to esc_html() is stripped of invalid or special characters
4460       * before output.
4461       *
4462       * @since 2.8.0
4463       *
4464       * @param string $safe_text The text after it has been escaped.
4465       * @param string $text      The text prior to being escaped.
4466       */
4467      return apply_filters( 'esc_html', $safe_text, $text );
4468  }
4469  
4470  /**
4471   * Escaping for HTML attributes.
4472   *
4473   * @since 2.8.0
4474   *
4475   * @param string $text
4476   * @return string
4477   */
4478  function esc_attr( $text ) {
4479      $safe_text = wp_check_invalid_utf8( $text );
4480      $safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );
4481      /**
4482       * Filters a string cleaned and escaped for output in an HTML attribute.
4483       *
4484       * Text passed to esc_attr() is stripped of invalid or special characters
4485       * before output.
4486       *
4487       * @since 2.0.6
4488       *
4489       * @param string $safe_text The text after it has been escaped.
4490       * @param string $text      The text prior to being escaped.
4491       */
4492      return apply_filters( 'attribute_escape', $safe_text, $text );
4493  }
4494  
4495  /**
4496   * Escaping for textarea values.
4497   *
4498   * @since 3.1.0
4499   *
4500   * @param string $text
4501   * @return string
4502   */
4503  function esc_textarea( $text ) {
4504      $safe_text = htmlspecialchars( $text, ENT_QUOTES, get_option( 'blog_charset' ) );
4505      /**
4506       * Filters a string cleaned and escaped for output in a textarea element.
4507       *
4508       * @since 3.1.0
4509       *
4510       * @param string $safe_text The text after it has been escaped.
4511       * @param string $text      The text prior to being escaped.
4512       */
4513      return apply_filters( 'esc_textarea', $safe_text, $text );
4514  }
4515  
4516  /**
4517   * Escape an HTML tag name.
4518   *
4519   * @since 2.5.0
4520   *
4521   * @param string $tag_name
4522   * @return string
4523   */
4524  function tag_escape( $tag_name ) {
4525      $safe_tag = strtolower( preg_replace( '/[^a-zA-Z0-9_:]/', '', $tag_name ) );
4526      /**
4527       * Filters a string cleaned and escaped for output as an HTML tag.
4528       *
4529       * @since 2.8.0
4530       *
4531       * @param string $safe_tag The tag name after it has been escaped.
4532       * @param string $tag_name The text before it was escaped.
4533       */
4534      return apply_filters( 'tag_escape', $safe_tag, $tag_name );
4535  }
4536  
4537  /**
4538   * Convert full URL paths to absolute paths.
4539   *
4540   * Removes the http or https protocols and the domain. Keeps the path '/' at the
4541   * beginning, so it isn't a true relative link, but from the web root base.
4542   *
4543   * @since 2.1.0
4544   * @since 4.1.0 Support was added for relative URLs.
4545   *
4546   * @param string $link Full URL path.
4547   * @return string Absolute path.
4548   */
4549  function wp_make_link_relative( $link ) {
4550      return preg_replace( '|^(https?:)?//[^/]+(/?.*)|i', '$2', $link );
4551  }
4552  
4553  /**
4554   * Sanitises various option values based on the nature of the option.
4555   *
4556   * This is basically a switch statement which will pass $value through a number
4557   * of functions depending on the $option.
4558   *
4559   * @since 2.0.5
4560   *
4561   * @global wpdb $wpdb WordPress database abstraction object.
4562   *
4563   * @param string $option The name of the option.
4564   * @param string $value  The unsanitised value.
4565   * @return string Sanitized value.
4566   */
4567  function sanitize_option( $option, $value ) {
4568      global $wpdb;
4569  
4570      $original_value = $value;
4571      $error          = '';
4572  
4573      switch ( $option ) {
4574          case 'admin_email':
4575          case 'new_admin_email':
4576              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4577              if ( is_wp_error( $value ) ) {
4578                  $error = $value->get_error_message();
4579              } else {
4580                  $value = sanitize_email( $value );
4581                  if ( ! is_email( $value ) ) {
4582                      $error = __( 'The email address entered did not appear to be a valid email address. Please enter a valid email address.' );
4583                  }
4584              }
4585              break;
4586  
4587          case 'thumbnail_size_w':
4588          case 'thumbnail_size_h':
4589          case 'medium_size_w':
4590          case 'medium_size_h':
4591          case 'medium_large_size_w':
4592          case 'medium_large_size_h':
4593          case 'large_size_w':
4594          case 'large_size_h':
4595          case 'mailserver_port':
4596          case 'comment_max_links':
4597          case 'page_on_front':
4598          case 'page_for_posts':
4599          case 'rss_excerpt_length':
4600          case 'default_category':
4601          case 'default_email_category':
4602          case 'default_link_category':
4603          case 'close_comments_days_old':
4604          case 'comments_per_page':
4605          case 'thread_comments_depth':
4606          case 'users_can_register':
4607          case 'start_of_week':
4608          case 'site_icon':
4609              $value = absint( $value );
4610              break;
4611  
4612          case 'posts_per_page':
4613          case 'posts_per_rss':
4614              $value = (int) $value;
4615              if ( empty( $value ) ) {
4616                  $value = 1;
4617              }
4618              if ( $value < -1 ) {
4619                  $value = abs( $value );
4620              }
4621              break;
4622  
4623          case 'default_ping_status':
4624          case 'default_comment_status':
4625              // Options that if not there have 0 value but need to be something like "closed"
4626              if ( $value == '0' || $value == '' ) {
4627                  $value = 'closed';
4628              }
4629              break;
4630  
4631          case 'blogdescription':
4632          case 'blogname':
4633              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4634              if ( $value !== $original_value ) {
4635                  $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', wp_encode_emoji( $original_value ) );
4636              }
4637  
4638              if ( is_wp_error( $value ) ) {
4639                  $error = $value->get_error_message();
4640              } else {
4641                  $value = esc_html( $value );
4642              }
4643              break;
4644  
4645          case 'blog_charset':
4646              $value = preg_replace( '/[^a-zA-Z0-9_-]/', '', $value ); // strips slashes
4647              break;
4648  
4649          case 'blog_public':
4650              // This is the value if the settings checkbox is not checked on POST. Don't rely on this.
4651              if ( null === $value ) {
4652                  $value = 1;
4653              } else {
4654                  $value = intval( $value );
4655              }
4656              break;
4657  
4658          case 'date_format':
4659          case 'time_format':
4660          case 'mailserver_url':
4661          case 'mailserver_login':
4662          case 'mailserver_pass':
4663          case 'upload_path':
4664              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4665              if ( is_wp_error( $value ) ) {
4666                  $error = $value->get_error_message();
4667              } else {
4668                  $value = strip_tags( $value );
4669                  $value = wp_kses_data( $value );
4670              }
4671              break;
4672  
4673          case 'ping_sites':
4674              $value = explode( "\n", $value );
4675              $value = array_filter( array_map( 'trim', $value ) );
4676              $value = array_filter( array_map( 'esc_url_raw', $value ) );
4677              $value = implode( "\n", $value );
4678              break;
4679  
4680          case 'gmt_offset':
4681              $value = preg_replace( '/[^0-9:.-]/', '', $value ); // strips slashes
4682              break;
4683  
4684          case 'siteurl':
4685              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4686              if ( is_wp_error( $value ) ) {
4687                  $error = $value->get_error_message();
4688              } else {
4689                  if ( preg_match( '#http(s?)://(.+)#i', $value ) ) {
4690                      $value = esc_url_raw( $value );
4691                  } else {
4692                      $error = __( 'The WordPress address you entered did not appear to be a valid URL. Please enter a valid URL.' );
4693                  }
4694              }
4695              break;
4696  
4697          case 'home':
4698              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4699              if ( is_wp_error( $value ) ) {
4700                  $error = $value->get_error_message();
4701              } else {
4702                  if ( preg_match( '#http(s?)://(.+)#i', $value ) ) {
4703                      $value = esc_url_raw( $value );
4704                  } else {
4705                      $error = __( 'The Site address you entered did not appear to be a valid URL. Please enter a valid URL.' );
4706                  }
4707              }
4708              break;
4709  
4710          case 'WPLANG':
4711              $allowed = get_available_languages();
4712              if ( ! is_multisite() && defined( 'WPLANG' ) && '' !== WPLANG && 'en_US' !== WPLANG ) {
4713                  $allowed[] = WPLANG;
4714              }
4715              if ( ! in_array( $value, $allowed ) && ! empty( $value ) ) {
4716                  $value = get_option( $option );
4717              }
4718              break;
4719  
4720          case 'illegal_names':
4721              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4722              if ( is_wp_error( $value ) ) {
4723                  $error = $value->get_error_message();
4724              } else {
4725                  if ( ! is_array( $value ) ) {
4726                      $value = explode( ' ', $value );
4727                  }
4728  
4729                  $value = array_values( array_filter( array_map( 'trim', $value ) ) );
4730  
4731                  if ( ! $value ) {
4732                      $value = '';
4733                  }
4734              }
4735              break;
4736  
4737          case 'limited_email_domains':
4738          case 'banned_email_domains':
4739              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4740              if ( is_wp_error( $value ) ) {
4741                  $error = $value->get_error_message();
4742              } else {
4743                  if ( ! is_array( $value ) ) {
4744                      $value = explode( "\n", $value );
4745                  }
4746  
4747                  $domains = array_values( array_filter( array_map( 'trim', $value ) ) );
4748                  $value   = array();
4749  
4750                  foreach ( $domains as $domain ) {
4751                      if ( ! preg_match( '/(--|\.\.)/', $domain ) && preg_match( '|^([a-zA-Z0-9-\.])+$|', $domain ) ) {
4752                          $value[] = $domain;
4753                      }
4754                  }
4755                  if ( ! $value ) {
4756                      $value = '';
4757                  }
4758              }
4759              break;
4760  
4761          case 'timezone_string':
4762              $allowed_zones = timezone_identifiers_list();
4763              if ( ! in_array( $value, $allowed_zones ) && ! empty( $value ) ) {
4764                  $error = __( 'The timezone you have entered is not valid. Please select a valid timezone.' );
4765              }
4766              break;
4767  
4768          case 'permalink_structure':
4769          case 'category_base':
4770          case 'tag_base':
4771              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4772              if ( is_wp_error( $value ) ) {
4773                  $error = $value->get_error_message();
4774              } else {
4775                  $value = esc_url_raw( $value );
4776                  $value = str_replace( 'http://', '', $value );
4777              }
4778  
4779              if ( 'permalink_structure' === $option && '' !== $value && ! preg_match( '/%[^\/%]+%/', $value ) ) {
4780                  $error = sprintf(
4781                      /* translators: %s: Documentation URL. */
4782                      __( 'A structure tag is required when using custom permalinks. <a href="%s">Learn more</a>' ),
4783                      __( 'https://wordpress.org/support/article/using-permalinks/#choosing-your-permalink-structure' )
4784                  );
4785              }
4786              break;
4787  
4788          case 'default_role':
4789              if ( ! get_role( $value ) && get_role( 'subscriber' ) ) {
4790                  $value = 'subscriber';
4791              }
4792              break;
4793  
4794          case 'moderation_keys':
4795          case 'blacklist_keys':
4796              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4797              if ( is_wp_error( $value ) ) {
4798                  $error = $value->get_error_message();
4799              } else {
4800                  $value = explode( "\n", $value );
4801                  $value = array_filter( array_map( 'trim', $value ) );
4802                  $value = array_unique( $value );
4803                  $value = implode( "\n", $value );
4804              }
4805              break;
4806      }
4807  
4808      if ( ! empty( $error ) ) {
4809          $value = get_option( $option );
4810          if ( function_exists( 'add_settings_error' ) ) {
4811              add_settings_error( $option, "invalid_{$option}", $error );
4812          }
4813      }
4814  
4815      /**
4816       * Filters an option value following sanitization.
4817       *
4818       * @since 2.3.0
4819       * @since 4.3.0 Added the `$original_value` parameter.
4820       *
4821       * @param string $value          The sanitized option value.
4822       * @param string $option         The option name.
4823       * @param string $original_value The original value passed to the function.
4824       */
4825      return apply_filters( "sanitize_option_{$option}", $value, $option, $original_value );
4826  }
4827  
4828  /**
4829   * Maps a function to all non-iterable elements of an array or an object.
4830   *
4831   * This is similar to `array_walk_recursive()` but acts upon objects too.
4832   *
4833   * @since 4.4.0
4834   *
4835   * @param mixed    $value    The array, object, or scalar.
4836   * @param callable $callback The function to map onto $value.
4837   * @return mixed The value with the callback applied to all non-arrays and non-objects inside it.
4838   */
4839  function map_deep( $value, $callback ) {
4840      if ( is_array( $value ) ) {
4841          foreach ( $value as $index => $item ) {
4842              $value[ $index ] = map_deep( $item, $callback );
4843          }
4844      } elseif ( is_object( $value ) ) {
4845          $object_vars = get_object_vars( $value );
4846          foreach ( $object_vars as $property_name => $property_value ) {
4847              $value->$property_name = map_deep( $property_value, $callback );
4848          }
4849      } else {
4850          $value = call_user_func( $callback, $value );
4851      }
4852  
4853      return $value;
4854  }
4855  
4856  /**
4857   * Parses a string into variables to be stored in an array.
4858   *
4859   *
4860   * @since 2.2.1
4861   *
4862   * @param string $string The string to be parsed.
4863   * @param array  $array  Variables will be stored in this array.
4864   */
4865  function wp_parse_str( $string, &$array ) {
4866      parse_str( $string, $array );
4867  
4868      /**
4869       * Filters the array of variables derived from a parsed string.
4870       *
4871       * @since 2.3.0
4872       *
4873       * @param array $array The array populated with variables.
4874       */
4875      $array = apply_filters( 'wp_parse_str', $array );
4876  }
4877  
4878  /**
4879   * Convert lone less than signs.
4880   *
4881   * KSES already converts lone greater than signs.
4882   *
4883   * @since 2.3.0
4884   *
4885   * @param string $text Text to be converted.
4886   * @return string Converted text.
4887   */
4888  function wp_pre_kses_less_than( $text ) {
4889      return preg_replace_callback( '%<[^>]*?((?=<)|>|$)%', 'wp_pre_kses_less_than_callback', $text );
4890  }
4891  
4892  /**
4893   * Callback function used by preg_replace.
4894   *
4895   * @since 2.3.0
4896   *
4897   * @param array $matches Populated by matches to preg_replace.
4898   * @return string The text returned after esc_html if needed.
4899   */
4900  function wp_pre_kses_less_than_callback( $matches ) {
4901      if ( false === strpos( $matches[0], '>' ) ) {
4902          return esc_html( $matches[0] );
4903      }
4904      return $matches[0];
4905  }
4906  
4907  /**
4908   * Remove non-allowable HTML from parsed block attribute values when filtering
4909   * in the post context.
4910   *
4911   * @since 5.3.1
4912   *
4913   * @param string         $string            Content to be run through KSES.
4914   * @param array[]|string $allowed_html      An array of allowed HTML elements
4915   *                                          and attributes, or a context name
4916   *                                          such as 'post'.
4917   * @param string[]       $allowed_protocols Array of allowed URL protocols.
4918   * @return string Filtered text to run through KSES.
4919   */
4920  function wp_pre_kses_block_attributes( $string, $allowed_html, $allowed_protocols ) {
4921      /*
4922       * `filter_block_content` is expected to call `wp_kses`. Temporarily remove
4923       * the filter to avoid recursion.
4924       */
4925      remove_filter( 'pre_kses', 'wp_pre_kses_block_attributes', 10 );
4926      $string = filter_block_content( $string, $allowed_html, $allowed_protocols );
4927      add_filter( 'pre_kses', 'wp_pre_kses_block_attributes', 10, 3 );
4928  
4929      return $string;
4930  }
4931  
4932  /**
4933   * WordPress implementation of PHP sprintf() with filters.
4934   *
4935   * @since 2.5.0
4936   * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
4937   *              by adding it to the function signature.
4938   *
4939   * @link https://www.php.net/sprintf
4940   *
4941   * @param string $pattern The string which formatted args are inserted.
4942   * @param mixed  ...$args Arguments to be formatted into the $pattern string.
4943   * @return string The formatted string.
4944   */
4945  function wp_sprintf( $pattern, ...$args ) {
4946      $len       = strlen( $pattern );
4947      $start     = 0;
4948      $result    = '';
4949      $arg_index = 0;
4950      while ( $len > $start ) {
4951          // Last character: append and break
4952          if ( strlen( $pattern ) - 1 == $start ) {
4953              $result .= substr( $pattern, -1 );
4954              break;
4955          }
4956  
4957          // Literal %: append and continue
4958          if ( substr( $pattern, $start, 2 ) == '%%' ) {
4959              $start  += 2;
4960              $result .= '%';
4961              continue;
4962          }
4963  
4964          // Get fragment before next %
4965          $end = strpos( $pattern, '%', $start + 1 );
4966          if ( false === $end ) {
4967              $end = $len;
4968          }
4969          $fragment = substr( $pattern, $start, $end - $start );
4970  
4971          // Fragment has a specifier
4972          if ( $pattern[ $start ] == '%' ) {
4973              // Find numbered arguments or take the next one in order
4974              if ( preg_match( '/^%(\d+)\$/', $fragment, $matches ) ) {
4975                  $index    = $matches[1] - 1; // 0-based array vs 1-based sprintf arguments.
4976                  $arg      = isset( $args[ $index ] ) ? $args[ $index ] : '';
4977                  $fragment = str_replace( "%{$matches[1]}$", '%', $fragment );
4978              } else {
4979                  $arg = isset( $args[ $arg_index ] ) ? $args[ $arg_index ] : '';
4980                  ++$arg_index;
4981              }
4982  
4983              /**
4984               * Filters a fragment from the pattern passed to wp_sprintf().
4985               *
4986               * If the fragment is unchanged, then sprintf() will be run on the fragment.
4987               *
4988               * @since 2.5.0
4989               *
4990               * @param string $fragment A fragment from the pattern.
4991               * @param string $arg      The argument.
4992               */
4993              $_fragment = apply_filters( 'wp_sprintf', $fragment, $arg );
4994              if ( $_fragment != $fragment ) {
4995                  $fragment = $_fragment;
4996              } else {
4997                  $fragment = sprintf( $fragment, strval( $arg ) );
4998              }
4999          }
5000  
5001          // Append to result and move to next fragment
5002          $result .= $fragment;
5003          $start   = $end;
5004      }
5005      return $result;
5006  }
5007  
5008  /**
5009   * Localize list items before the rest of the content.
5010   *
5011   * The '%l' must be at the first characters can then contain the rest of the
5012   * content. The list items will have ', ', ', and', and ' and ' added depending
5013   * on the amount of list items in the $args parameter.
5014   *
5015   * @since 2.5.0
5016   *
5017   * @param string $pattern Content containing '%l' at the beginning.
5018   * @param array  $args    List items to prepend to the content and replace '%l'.
5019   * @return string Localized list items and rest of the content.
5020   */
5021  function wp_sprintf_l( $pattern, $args ) {
5022      // Not a match
5023      if ( substr( $pattern, 0, 2 ) != '%l' ) {
5024          return $pattern;
5025      }
5026  
5027      // Nothing to work with
5028      if ( empty( $args ) ) {
5029          return '';
5030      }
5031  
5032      /**
5033       * Filters the translated delimiters used by wp_sprintf_l().
5034       * Placeholders (%s) are included to assist translators and then
5035       * removed before the array of strings reaches the filter.
5036       *
5037       * Please note: Ampersands and entities should be avoided here.
5038       *
5039       * @since 2.5.0
5040       *
5041       * @param array $delimiters An array of translated delimiters.
5042       */
5043      $l = apply_filters(
5044          'wp_sprintf_l',
5045          array(
5046              /* translators: Used to join items in a list with more than 2 items. */
5047              'between'          => sprintf( __( '%1$s, %2$s' ), '', '' ),
5048              /* translators: Used to join last two items in a list with more than 2 times. */
5049              'between_last_two' => sprintf( __( '%1$s, and %2$s' ), '', '' ),
5050              /* translators: Used to join items in a list with only 2 items. */
5051              'between_only_two' => sprintf( __( '%1$s and %2$s' ), '', '' ),
5052          )
5053      );
5054  
5055      $args   = (array) $args;
5056      $result = array_shift( $args );
5057      if ( count( $args ) == 1 ) {
5058          $result .= $l['between_only_two'] . array_shift( $args );
5059      }
5060      // Loop when more than two args
5061      $i = count( $args );
5062      while ( $i ) {
5063          $arg = array_shift( $args );
5064          $i--;
5065          if ( 0 == $i ) {
5066              $result .= $l['between_last_two'] . $arg;
5067          } else {
5068              $result .= $l['between'] . $arg;
5069          }
5070      }
5071      return $result . substr( $pattern, 2 );
5072  }
5073  
5074  /**
5075   * Safely extracts not more than the first $count characters from html string.
5076   *
5077   * UTF-8, tags and entities safe prefix extraction. Entities inside will *NOT*
5078   * be counted as one character. For example &amp; will be counted as 4, &lt; as
5079   * 3, etc.
5080   *
5081   * @since 2.5.0
5082   *
5083   * @param string $str   String to get the excerpt from.
5084   * @param int    $count Maximum number of characters to take.
5085   * @param string $more  Optional. What to append if $str needs to be trimmed. Defaults to empty string.
5086   * @return string The excerpt.
5087   */
5088  function wp_html_excerpt( $str, $count, $more = null ) {
5089      if ( null === $more ) {
5090          $more = '';
5091      }
5092      $str     = wp_strip_all_tags( $str, true );
5093      $excerpt = mb_substr( $str, 0, $count );
5094      // remove part of an entity at the end
5095      $excerpt = preg_replace( '/&[^;\s]{0,6}$/', '', $excerpt );
5096      if ( $str != $excerpt ) {
5097          $excerpt = trim( $excerpt ) . $more;
5098      }
5099      return $excerpt;
5100  }
5101  
5102  /**
5103   * Add a Base url to relative links in passed content.
5104   *
5105   * By default it supports the 'src' and 'href' attributes. However this can be
5106   * changed via the 3rd param.
5107   *
5108   * @since 2.7.0
5109   *
5110   * @global string $_links_add_base
5111   *
5112   * @param string $content String to search for links in.
5113   * @param string $base    The base URL to prefix to links.
5114   * @param array  $attrs   The attributes which should be processed.
5115   * @return string The processed content.
5116   */
5117  function links_add_base_url( $content, $base, $attrs = array( 'src', 'href' ) ) {
5118      global $_links_add_base;
5119      $_links_add_base = $base;
5120      $attrs           = implode( '|', (array) $attrs );
5121      return preg_replace_callback( "!($attrs)=(['\"])(.+?)\\2!i", '_links_add_base', $content );
5122  }
5123  
5124  /**
5125   * Callback to add a base url to relative links in passed content.
5126   *
5127   * @since 2.7.0
5128   * @access private
5129   *
5130   * @global string $_links_add_base
5131   *
5132   * @param string $m The matched link.
5133   * @return string The processed link.
5134   */
5135  function _links_add_base( $m ) {
5136      global $_links_add_base;
5137      //1 = attribute name  2 = quotation mark  3 = URL
5138      return $m[1] . '=' . $m[2] .
5139          ( preg_match( '#^(\w{1,20}):#', $m[3], $protocol ) && in_array( $protocol[1], wp_allowed_protocols() ) ?
5140              $m[3] :
5141              WP_Http::make_absolute_url( $m[3], $_links_add_base )
5142          )
5143          . $m[2];
5144  }
5145  
5146  /**
5147   * Adds a Target attribute to all links in passed content.
5148   *
5149   * This function by default only applies to `<a>` tags, however this can be
5150   * modified by the 3rd param.
5151   *
5152   * *NOTE:* Any current target attributed will be stripped and replaced.
5153   *
5154   * @since 2.7.0
5155   *
5156   * @global string $_links_add_target
5157   *
5158   * @param string   $content String to search for links in.
5159   * @param string   $target  The Target to add to the links.
5160   * @param string[] $tags    An array of tags to apply to.
5161   * @return string The processed content.
5162   */
5163  function links_add_target( $content, $target = '_blank', $tags = array( 'a' ) ) {
5164      global $_links_add_target;
5165      $_links_add_target = $target;
5166      $tags              = implode( '|', (array) $tags );
5167      return preg_replace_callback( "!<($tags)([^>]*)>!i", '_links_add_target', $content );
5168  }
5169  
5170  /**
5171   * Callback to add a target attribute to all links in passed content.
5172   *
5173   * @since 2.7.0
5174   * @access private
5175   *
5176   * @global string $_links_add_target
5177   *
5178   * @param string $m The matched link.
5179   * @return string The processed link.
5180   */
5181  function _links_add_target( $m ) {
5182      global $_links_add_target;
5183      $tag  = $m[1];
5184      $link = preg_replace( '|( target=([\'"])(.*?)\2)|i', '', $m[2] );
5185      return '<' . $tag . $link . ' target="' . esc_attr( $_links_add_target ) . '">';
5186  }
5187  
5188  /**
5189   * Normalize EOL characters and strip duplicate whitespace.
5190   *
5191   * @since 2.7.0
5192   *
5193   * @param string $str The string to normalize.
5194   * @return string The normalized string.
5195   */
5196  function normalize_whitespace( $str ) {
5197      $str = trim( $str );
5198      $str = str_replace( "\r", "\n", $str );
5199      $str = preg_replace( array( '/\n+/', '/[ \t]+/' ), array( "\n", ' ' ), $str );
5200      return $str;
5201  }
5202  
5203  /**
5204   * Properly strip all HTML tags including script and style
5205   *
5206   * This differs from strip_tags() because it removes the contents of
5207   * the `<script>` and `<style>` tags. E.g. `strip_tags( '<script>something</script>' )`
5208   * will return 'something'. wp_strip_all_tags will return ''
5209   *
5210   * @since 2.9.0
5211   *
5212   * @param string $string        String containing HTML tags
5213   * @param bool   $remove_breaks Optional. Whether to remove left over line breaks and white space chars
5214   * @return string The processed string.
5215   */
5216  function wp_strip_all_tags( $string, $remove_breaks = false ) {
5217      $string = preg_replace( '@<(script|style)[^>]*?>.*?</\\1>@si', '', $string );
5218      $string = strip_tags( $string );
5219  
5220      if ( $remove_breaks ) {
5221          $string = preg_replace( '/[\r\n\t ]+/', ' ', $string );
5222      }
5223  
5224      return trim( $string );
5225  }
5226  
5227  /**
5228   * Sanitizes a string from user input or from the database.
5229   *
5230   * - Checks for invalid UTF-8,
5231   * - Converts single `<` characters to entities
5232   * - Strips all tags
5233   * - Removes line breaks, tabs, and extra whitespace
5234   * - Strips octets
5235   *
5236   * @since 2.9.0
5237   *
5238   * @see sanitize_textarea_field()
5239   * @see wp_check_invalid_utf8()
5240   * @see wp_strip_all_tags()
5241   *
5242   * @param string $str String to sanitize.
5243   * @return string Sanitized string.
5244   */
5245  function sanitize_text_field( $str ) {
5246      $filtered = _sanitize_text_fields( $str, false );
5247  
5248      /**
5249       * Filters a sanitized text field string.
5250       *
5251       * @since 2.9.0
5252       *
5253       * @param string $filtered The sanitized string.
5254       * @param string $str      The string prior to being sanitized.
5255       */
5256      return apply_filters( 'sanitize_text_field', $filtered, $str );
5257  }
5258  
5259  /**
5260   * Sanitizes a multiline string from user input or from the database.
5261   *
5262   * The function is like sanitize_text_field(), but preserves
5263   * new lines (\n) and other whitespace, which are legitimate
5264   * input in textarea elements.
5265   *
5266   * @see sanitize_text_field()
5267   *
5268   * @since 4.7.0
5269   *
5270   * @param string $str String to sanitize.
5271   * @return string Sanitized string.
5272   */
5273  function sanitize_textarea_field( $str ) {
5274      $filtered = _sanitize_text_fields( $str, true );
5275  
5276      /**
5277       * Filters a sanitized textarea field string.
5278       *
5279       * @since 4.7.0
5280       *
5281       * @param string $filtered The sanitized string.
5282       * @param string $str      The string prior to being sanitized.
5283       */
5284      return apply_filters( 'sanitize_textarea_field', $filtered, $str );
5285  }
5286  
5287  /**
5288   * Internal helper function to sanitize a string from user input or from the db
5289   *
5290   * @since 4.7.0
5291   * @access private
5292   *
5293   * @param string $str String to sanitize.
5294   * @param bool $keep_newlines optional Whether to keep newlines. Default: false.
5295   * @return string Sanitized string.
5296   */
5297  function _sanitize_text_fields( $str, $keep_newlines = false ) {
5298      if ( is_object( $str ) || is_array( $str ) ) {
5299          return '';
5300      }
5301  
5302      $str = (string) $str;
5303  
5304      $filtered = wp_check_invalid_utf8( $str );
5305  
5306      if ( strpos( $filtered, '<' ) !== false ) {
5307          $filtered = wp_pre_kses_less_than( $filtered );
5308          // This will strip extra whitespace for us.
5309          $filtered = wp_strip_all_tags( $filtered, false );
5310  
5311          // Use html entities in a special case to make sure no later
5312          // newline stripping stage could lead to a functional tag
5313          $filtered = str_replace( "<\n", "&lt;\n", $filtered );
5314      }
5315  
5316      if ( ! $keep_newlines ) {
5317          $filtered = preg_replace( '/[\r\n\t ]+/', ' ', $filtered );
5318      }
5319      $filtered = trim( $filtered );
5320  
5321      $found = false;
5322      while ( preg_match( '/%[a-f0-9]{2}/i', $filtered, $match ) ) {
5323          $filtered = str_replace( $match[0], '', $filtered );
5324          $found    = true;
5325      }
5326  
5327      if ( $found ) {
5328          // Strip out the whitespace that may now exist after removing the octets.
5329          $filtered = trim( preg_replace( '/ +/', ' ', $filtered ) );
5330      }
5331  
5332      return $filtered;
5333  }
5334  
5335  /**
5336   * i18n friendly version of basename()
5337   *
5338   * @since 3.1.0
5339   *
5340   * @param string $path   A path.
5341   * @param string $suffix If the filename ends in suffix this will also be cut off.
5342   * @return string
5343   */
5344  function wp_basename( $path, $suffix = '' ) {
5345      return urldecode( basename( str_replace( array( '%2F', '%5C' ), '/',