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

   1  <?php
   2  /**
   3   * WordPress API for creating bbcode-like tags or what WordPress calls
   4   * "shortcodes". The tag and attribute parsing or regular expression code is
   5   * based on the Textpattern tag parser.
   6   *
   7   * A few examples are below:
   8   *
   9   * [shortcode /]
  10   * [shortcode foo="bar" baz="bing" /]
  11   * [shortcode foo="bar"]content[/shortcode]
  12   *
  13   * Shortcode tags support attributes and enclosed content, but does not entirely
  14   * support inline shortcodes in other shortcodes. You will have to call the
  15   * shortcode parser in your function to account for that.
  16   *
  17   * {@internal
  18   * Please be aware that the above note was made during the beta of WordPress 2.6
  19   * and in the future may not be accurate. Please update the note when it is no
  20   * longer the case.}}
  21   *
  22   * To apply shortcode tags to content:
  23   *
  24   *     $out = do_shortcode( $content );
  25   *
  26   * @link https://codex.wordpress.org/Shortcode_API
  27   *
  28   * @package WordPress
  29   * @subpackage Shortcodes
  30   * @since 2.5.0
  31   */
  32  
  33  /**
  34   * Container for storing shortcode tags and their hook to call for the shortcode
  35   *
  36   * @since 2.5.0
  37   *
  38   * @name $shortcode_tags
  39   * @var array
  40   * @global array $shortcode_tags
  41   */
  42  $shortcode_tags = array();
  43  
  44  /**
  45   * Adds a new shortcode.
  46   *
  47   * Care should be taken through prefixing or other means to ensure that the
  48   * shortcode tag being added is unique and will not conflict with other,
  49   * already-added shortcode tags. In the event of a duplicated tag, the tag
  50   * loaded last will take precedence.
  51   *
  52   * @since 2.5.0
  53   *
  54   * @global array $shortcode_tags
  55   *
  56   * @param string   $tag      Shortcode tag to be searched in post content.
  57   * @param callable $callback The callback function to run when the shortcode is found.
  58   *                           Every shortcode callback is passed three parameters by default,
  59   *                           including an array of attributes (`$atts`), the shortcode content
  60   *                           or null if not set (`$content`), and finally the shortcode tag
  61   *                           itself (`$shortcode_tag`), in that order.
  62   */
  63  function add_shortcode( $tag, $callback ) {
  64      global $shortcode_tags;
  65  
  66      if ( '' == trim( $tag ) ) {
  67          $message = __( 'Invalid shortcode name: Empty name given.' );
  68          _doing_it_wrong( __FUNCTION__, $message, '4.4.0' );
  69          return;
  70      }
  71  
  72      if ( 0 !== preg_match( '@[<>&/\[\]\x00-\x20=]@', $tag ) ) {
  73          /* translators: 1: shortcode name, 2: space separated list of reserved characters */
  74          $message = sprintf( __( 'Invalid shortcode name: %1$s. Do not use spaces or reserved characters: %2$s' ), $tag, '& / < > [ ] =' );
  75          _doing_it_wrong( __FUNCTION__, $message, '4.4.0' );
  76          return;
  77      }
  78  
  79      $shortcode_tags[ $tag ] = $callback;
  80  }
  81  
  82  /**
  83   * Removes hook for shortcode.
  84   *
  85   * @since 2.5.0
  86   *
  87   * @global array $shortcode_tags
  88   *
  89   * @param string $tag Shortcode tag to remove hook for.
  90   */
  91  function remove_shortcode( $tag ) {
  92      global $shortcode_tags;
  93  
  94      unset( $shortcode_tags[ $tag ] );
  95  }
  96  
  97  /**
  98   * Clear all shortcodes.
  99   *
 100   * This function is simple, it clears all of the shortcode tags by replacing the
 101   * shortcodes global by a empty array. This is actually a very efficient method
 102   * for removing all shortcodes.
 103   *
 104   * @since 2.5.0
 105   *
 106   * @global array $shortcode_tags
 107   */
 108  function remove_all_shortcodes() {
 109      global $shortcode_tags;
 110  
 111      $shortcode_tags = array();
 112  }
 113  
 114  /**
 115   * Whether a registered shortcode exists named $tag
 116   *
 117   * @since 3.6.0
 118   *
 119   * @global array $shortcode_tags List of shortcode tags and their callback hooks.
 120   *
 121   * @param string $tag Shortcode tag to check.
 122   * @return bool Whether the given shortcode exists.
 123   */
 124  function shortcode_exists( $tag ) {
 125      global $shortcode_tags;
 126      return array_key_exists( $tag, $shortcode_tags );
 127  }
 128  
 129  /**
 130   * Whether the passed content contains the specified shortcode
 131   *
 132   * @since 3.6.0
 133   *
 134   * @global array $shortcode_tags
 135   *
 136   * @param string $content Content to search for shortcodes.
 137   * @param string $tag     Shortcode tag to check.
 138   * @return bool Whether the passed content contains the given shortcode.
 139   */
 140  function has_shortcode( $content, $tag ) {
 141      if ( false === strpos( $content, '[' ) ) {
 142          return false;
 143      }
 144  
 145      if ( shortcode_exists( $tag ) ) {
 146          preg_match_all( '/' . get_shortcode_regex() . '/', $content, $matches, PREG_SET_ORDER );
 147          if ( empty( $matches ) ) {
 148              return false;
 149          }
 150  
 151          foreach ( $matches as $shortcode ) {
 152              if ( $tag === $shortcode[2] ) {
 153                  return true;
 154              } elseif ( ! empty( $shortcode[5] ) && has_shortcode( $shortcode[5], $tag ) ) {
 155                  return true;
 156              }
 157          }
 158      }
 159      return false;
 160  }
 161  
 162  /**
 163   * Search content for shortcodes and filter shortcodes through their hooks.
 164   *
 165   * If there are no shortcode tags defined, then the content will be returned
 166   * without any filtering. This might cause issues when plugins are disabled but
 167   * the shortcode will still show up in the post or content.
 168   *
 169   * @since 2.5.0
 170   *
 171   * @global array $shortcode_tags List of shortcode tags and their callback hooks.
 172   *
 173   * @param string $content Content to search for shortcodes.
 174   * @param bool $ignore_html When true, shortcodes inside HTML elements will be skipped.
 175   * @return string Content with shortcodes filtered out.
 176   */
 177  function do_shortcode( $content, $ignore_html = false ) {
 178      global $shortcode_tags;
 179  
 180      if ( false === strpos( $content, '[' ) ) {
 181          return $content;
 182      }
 183  
 184      if ( empty( $shortcode_tags ) || ! is_array( $shortcode_tags ) ) {
 185          return $content;
 186      }
 187  
 188      // Find all registered tag names in $content.
 189      preg_match_all( '@\[([^<>&/\[\]\x00-\x20=]++)@', $content, $matches );
 190      $tagnames = array_intersect( array_keys( $shortcode_tags ), $matches[1] );
 191  
 192      if ( empty( $tagnames ) ) {
 193          return $content;
 194      }
 195  
 196      $content = do_shortcodes_in_html_tags( $content, $ignore_html, $tagnames );
 197  
 198      $pattern = get_shortcode_regex( $tagnames );
 199      $content = preg_replace_callback( "/$pattern/", 'do_shortcode_tag', $content );
 200  
 201      // Always restore square braces so we don't break things like <!--[if IE ]>
 202      $content = unescape_invalid_shortcodes( $content );
 203  
 204      return $content;
 205  }
 206  
 207  /**
 208   * Retrieve the shortcode regular expression for searching.
 209   *
 210   * The regular expression combines the shortcode tags in the regular expression
 211   * in a regex class.
 212   *
 213   * The regular expression contains 6 different sub matches to help with parsing.
 214   *
 215   * 1 - An extra [ to allow for escaping shortcodes with double [[]]
 216   * 2 - The shortcode name
 217   * 3 - The shortcode argument list
 218   * 4 - The self closing /
 219   * 5 - The content of a shortcode when it wraps some content.
 220   * 6 - An extra ] to allow for escaping shortcodes with double [[]]
 221   *
 222   * @since 2.5.0
 223   * @since 4.4.0 Added the `$tagnames` parameter.
 224   *
 225   * @global array $shortcode_tags
 226   *
 227   * @param array $tagnames Optional. List of shortcodes to find. Defaults to all registered shortcodes.
 228   * @return string The shortcode search regular expression
 229   */
 230  function get_shortcode_regex( $tagnames = null ) {
 231      global $shortcode_tags;
 232  
 233      if ( empty( $tagnames ) ) {
 234          $tagnames = array_keys( $shortcode_tags );
 235      }
 236      $tagregexp = join( '|', array_map( 'preg_quote', $tagnames ) );
 237  
 238      // WARNING! Do not change this regex without changing do_shortcode_tag() and strip_shortcode_tag()
 239      // Also, see shortcode_unautop() and shortcode.js.
 240  
 241      // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
 242      return
 243          '\\['                                // Opening bracket
 244          . '(\\[?)'                           // 1: Optional second opening bracket for escaping shortcodes: [[tag]]
 245          . "($tagregexp)"                     // 2: Shortcode name
 246          . '(?![\\w-])'                       // Not followed by word character or hyphen
 247          . '('                                // 3: Unroll the loop: Inside the opening shortcode tag
 248          .     '[^\\]\\/]*'                   // Not a closing bracket or forward slash
 249          .     '(?:'
 250          .         '\\/(?!\\])'               // A forward slash not followed by a closing bracket
 251          .         '[^\\]\\/]*'               // Not a closing bracket or forward slash
 252          .     ')*?'
 253          . ')'
 254          . '(?:'
 255          .     '(\\/)'                        // 4: Self closing tag ...
 256          .     '\\]'                          // ... and closing bracket
 257          . '|'
 258          .     '\\]'                          // Closing bracket
 259          .     '(?:'
 260          .         '('                        // 5: Unroll the loop: Optionally, anything between the opening and closing shortcode tags
 261          .             '[^\\[]*+'             // Not an opening bracket
 262          .             '(?:'
 263          .                 '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag
 264          .                 '[^\\[]*+'         // Not an opening bracket
 265          .             ')*+'
 266          .         ')'
 267          .         '\\[\\/\\2\\]'             // Closing shortcode tag
 268          .     ')?'
 269          . ')'
 270          . '(\\]?)';                          // 6: Optional second closing brocket for escaping shortcodes: [[tag]]
 271      // phpcs:enable
 272  }
 273  
 274  /**
 275   * Regular Expression callable for do_shortcode() for calling shortcode hook.
 276   *
 277   * @see get_shortcode_regex for details of the match array contents.
 278   *
 279   * @since 2.5.0
 280   * @access private
 281   *
 282   * @global array $shortcode_tags
 283   *
 284   * @param array $m Regular expression match array
 285   * @return string|false False on failure.
 286   */
 287  function do_shortcode_tag( $m ) {
 288      global $shortcode_tags;
 289  
 290      // allow [[foo]] syntax for escaping a tag
 291      if ( $m[1] == '[' && $m[6] == ']' ) {
 292          return substr( $m[0], 1, -1 );
 293      }
 294  
 295      $tag  = $m[2];
 296      $attr = shortcode_parse_atts( $m[3] );
 297  
 298      if ( ! is_callable( $shortcode_tags[ $tag ] ) ) {
 299          /* translators: %s: shortcode tag */
 300          $message = sprintf( __( 'Attempting to parse a shortcode without a valid callback: %s' ), $tag );
 301          _doing_it_wrong( __FUNCTION__, $message, '4.3.0' );
 302          return $m[0];
 303      }
 304  
 305      /**
 306       * Filters whether to call a shortcode callback.
 307       *
 308       * Passing a truthy value to the filter will effectively short-circuit the
 309       * shortcode generation process, returning that value instead.
 310       *
 311       * @since 4.7.0
 312       *
 313       * @param bool|string $return      Short-circuit return value. Either false or the value to replace the shortcode with.
 314       * @param string       $tag         Shortcode name.
 315       * @param array|string $attr        Shortcode attributes array or empty string.
 316       * @param array        $m           Regular expression match array.
 317       */
 318      $return = apply_filters( 'pre_do_shortcode_tag', false, $tag, $attr, $m );
 319      if ( false !== $return ) {
 320          return $return;
 321      }
 322  
 323      $content = isset( $m[5] ) ? $m[5] : null;
 324  
 325      $output = $m[1] . call_user_func( $shortcode_tags[ $tag ], $attr, $content, $tag ) . $m[6];
 326  
 327      /**
 328       * Filters the output created by a shortcode callback.
 329       *
 330       * @since 4.7.0
 331       *
 332       * @param string       $output Shortcode output.
 333       * @param string       $tag    Shortcode name.
 334       * @param array|string $attr   Shortcode attributes array or empty string.
 335       * @param array        $m      Regular expression match array.
 336       */
 337      return apply_filters( 'do_shortcode_tag', $output, $tag, $attr, $m );
 338  }
 339  
 340  /**
 341   * Search only inside HTML elements for shortcodes and process them.
 342   *
 343   * Any [ or ] characters remaining inside elements will be HTML encoded
 344   * to prevent interference with shortcodes that are outside the elements.
 345   * Assumes $content processed by KSES already.  Users with unfiltered_html
 346   * capability may get unexpected output if angle braces are nested in tags.
 347   *
 348   * @since 4.2.3
 349   *
 350   * @param string $content Content to search for shortcodes
 351   * @param bool $ignore_html When true, all square braces inside elements will be encoded.
 352   * @param array $tagnames List of shortcodes to find.
 353   * @return string Content with shortcodes filtered out.
 354   */
 355  function do_shortcodes_in_html_tags( $content, $ignore_html, $tagnames ) {
 356      // Normalize entities in unfiltered HTML before adding placeholders.
 357      $trans   = array(
 358          '&#91;' => '&#091;',
 359          '&#93;' => '&#093;',
 360      );
 361      $content = strtr( $content, $trans );
 362      $trans   = array(
 363          '[' => '&#91;',
 364          ']' => '&#93;',
 365      );
 366  
 367      $pattern = get_shortcode_regex( $tagnames );
 368      $textarr = wp_html_split( $content );
 369  
 370      foreach ( $textarr as &$element ) {
 371          if ( '' == $element || '<' !== $element[0] ) {
 372              continue;
 373          }
 374  
 375          $noopen  = false === strpos( $element, '[' );
 376          $noclose = false === strpos( $element, ']' );
 377          if ( $noopen || $noclose ) {
 378              // This element does not contain shortcodes.
 379              if ( $noopen xor $noclose ) {
 380                  // Need to encode stray [ or ] chars.
 381                  $element = strtr( $element, $trans );
 382              }
 383              continue;
 384          }
 385  
 386          if ( $ignore_html || '<!--' === substr( $element, 0, 4 ) || '<![CDATA[' === substr( $element, 0, 9 ) ) {
 387              // Encode all [ and ] chars.
 388              $element = strtr( $element, $trans );
 389              continue;
 390          }
 391  
 392          $attributes = wp_kses_attr_parse( $element );
 393          if ( false === $attributes ) {
 394              // Some plugins are doing things like [name] <[email]>.
 395              if ( 1 === preg_match( '%^<\s*\[\[?[^\[\]]+\]%', $element ) ) {
 396                  $element = preg_replace_callback( "/$pattern/", 'do_shortcode_tag', $element );
 397              }
 398  
 399              // Looks like we found some crazy unfiltered HTML.  Skipping it for sanity.
 400              $element = strtr( $element, $trans );
 401              continue;
 402          }
 403  
 404          // Get element name
 405          $front   = array_shift( $attributes );
 406          $back    = array_pop( $attributes );
 407          $matches = array();
 408          preg_match( '%[a-zA-Z0-9]+%', $front, $matches );
 409          $elname = $matches[0];
 410  
 411          // Look for shortcodes in each attribute separately.
 412          foreach ( $attributes as &$attr ) {
 413              $open  = strpos( $attr, '[' );
 414              $close = strpos( $attr, ']' );
 415              if ( false === $open || false === $close ) {
 416                  continue; // Go to next attribute.  Square braces will be escaped at end of loop.
 417              }
 418              $double = strpos( $attr, '"' );
 419              $single = strpos( $attr, "'" );
 420              if ( ( false === $single || $open < $single ) && ( false === $double || $open < $double ) ) {
 421                  // $attr like '[shortcode]' or 'name = [shortcode]' implies unfiltered_html.
 422                  // In this specific situation we assume KSES did not run because the input
 423                  // was written by an administrator, so we should avoid changing the output
 424                  // and we do not need to run KSES here.
 425                  $attr = preg_replace_callback( "/$pattern/", 'do_shortcode_tag', $attr );
 426              } else {
 427                  // $attr like 'name = "[shortcode]"' or "name = '[shortcode]'"
 428                  // We do not know if $content was unfiltered. Assume KSES ran before shortcodes.
 429                  $count    = 0;
 430                  $new_attr = preg_replace_callback( "/$pattern/", 'do_shortcode_tag', $attr, -1, $count );
 431                  if ( $count > 0 ) {
 432                      // Sanitize the shortcode output using KSES.
 433                      $new_attr = wp_kses_one_attr( $new_attr, $elname );
 434                      if ( '' !== trim( $new_attr ) ) {
 435                          // The shortcode is safe to use now.
 436                          $attr = $new_attr;
 437                      }
 438                  }
 439              }
 440          }
 441          $element = $front . implode( '', $attributes ) . $back;
 442  
 443          // Now encode any remaining [ or ] chars.
 444          $element = strtr( $element, $trans );
 445      }
 446  
 447      $content = implode( '', $textarr );
 448  
 449      return $content;
 450  }
 451  
 452  /**
 453   * Remove placeholders added by do_shortcodes_in_html_tags().
 454   *
 455   * @since 4.2.3
 456   *
 457   * @param string $content Content to search for placeholders.
 458   * @return string Content with placeholders removed.
 459   */
 460  function unescape_invalid_shortcodes( $content ) {
 461      // Clean up entire string, avoids re-parsing HTML.
 462      $trans = array(
 463          '&#91;' => '[',
 464          '&#93;' => ']',
 465      );
 466  
 467      $content = strtr( $content, $trans );
 468  
 469      return $content;
 470  }
 471  
 472  /**
 473   * Retrieve the shortcode attributes regex.
 474   *
 475   * @since 4.4.0
 476   *
 477   * @return string The shortcode attribute regular expression
 478   */
 479  function get_shortcode_atts_regex() {
 480      return '/([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\w-]+)\s*=\s*\'([^\']*)\'(?:\s|$)|([\w-]+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|\'([^\']*)\'(?:\s|$)|(\S+)(?:\s|$)/';
 481  }
 482  
 483  /**
 484   * Retrieve all attributes from the shortcodes tag.
 485   *
 486   * The attributes list has the attribute name as the key and the value of the
 487   * attribute as the value in the key/value pair. This allows for easier
 488   * retrieval of the attributes, since all attributes have to be known.
 489   *
 490   * @since 2.5.0
 491   *
 492   * @param string $text
 493   * @return array|string List of attribute values.
 494   *                      Returns empty array if trim( $text ) == '""'.
 495   *                      Returns empty string if trim( $text ) == ''.
 496   *                      All other matches are checked for not empty().
 497   */
 498  function shortcode_parse_atts( $text ) {
 499      $atts    = array();
 500      $pattern = get_shortcode_atts_regex();
 501      $text    = preg_replace( "/[\x{00a0}\x{200b}]+/u", ' ', $text );
 502      if ( preg_match_all( $pattern, $text, $match, PREG_SET_ORDER ) ) {
 503          foreach ( $match as $m ) {
 504              if ( ! empty( $m[1] ) ) {
 505                  $atts[ strtolower( $m[1] ) ] = stripcslashes( $m[2] );
 506              } elseif ( ! empty( $m[3] ) ) {
 507                  $atts[ strtolower( $m[3] ) ] = stripcslashes( $m[4] );
 508              } elseif ( ! empty( $m[5] ) ) {
 509                  $atts[ strtolower( $m[5] ) ] = stripcslashes( $m[6] );
 510              } elseif ( isset( $m[7] ) && strlen( $m[7] ) ) {
 511                  $atts[] = stripcslashes( $m[7] );
 512              } elseif ( isset( $m[8] ) && strlen( $m[8] ) ) {
 513                  $atts[] = stripcslashes( $m[8] );
 514              } elseif ( isset( $m[9] ) ) {
 515                  $atts[] = stripcslashes( $m[9] );
 516              }
 517          }
 518  
 519          // Reject any unclosed HTML elements
 520          foreach ( $atts as &$value ) {
 521              if ( false !== strpos( $value, '<' ) ) {
 522                  if ( 1 !== preg_match( '/^[^<]*+(?:<[^>]*+>[^<]*+)*+$/', $value ) ) {
 523                      $value = '';
 524                  }
 525              }
 526          }
 527      } else {
 528          $atts = ltrim( $text );
 529      }
 530      return $atts;
 531  }
 532  
 533  /**
 534   * Combine user attributes with known attributes and fill in defaults when needed.
 535   *
 536   * The pairs should be considered to be all of the attributes which are
 537   * supported by the caller and given as a list. The returned attributes will
 538   * only contain the attributes in the $pairs list.
 539   *
 540   * If the $atts list has unsupported attributes, then they will be ignored and
 541   * removed from the final returned list.
 542   *
 543   * @since 2.5.0
 544   *
 545   * @param array  $pairs     Entire list of supported attributes and their defaults.
 546   * @param array  $atts      User defined attributes in shortcode tag.
 547   * @param string $shortcode Optional. The name of the shortcode, provided for context to enable filtering
 548   * @return array Combined and filtered attribute list.
 549   */
 550  function shortcode_atts( $pairs, $atts, $shortcode = '' ) {
 551      $atts = (array) $atts;
 552      $out  = array();
 553      foreach ( $pairs as $name => $default ) {
 554          if ( array_key_exists( $name, $atts ) ) {
 555              $out[ $name ] = $atts[ $name ];
 556          } else {
 557              $out[ $name ] = $default;
 558          }
 559      }
 560      /**
 561       * Filters a shortcode's default attributes.
 562       *
 563       * If the third parameter of the shortcode_atts() function is present then this filter is available.
 564       * The third parameter, $shortcode, is the name of the shortcode.
 565       *
 566       * @since 3.6.0
 567       * @since 4.4.0 Added the `$shortcode` parameter.
 568       *
 569       * @param array  $out       The output array of shortcode attributes.
 570       * @param array  $pairs     The supported attributes and their defaults.
 571       * @param array  $atts      The user defined shortcode attributes.
 572       * @param string $shortcode The shortcode name.
 573       */
 574      if ( $shortcode ) {
 575          $out = apply_filters( "shortcode_atts_{$shortcode}", $out, $pairs, $atts, $shortcode );
 576      }
 577  
 578      return $out;
 579  }
 580  
 581  /**
 582   * Remove all shortcode tags from the given content.
 583   *
 584   * @since 2.5.0
 585   *
 586   * @global array $shortcode_tags
 587   *
 588   * @param string $content Content to remove shortcode tags.
 589   * @return string Content without shortcode tags.
 590   */
 591  function strip_shortcodes( $content ) {
 592      global $shortcode_tags;
 593  
 594      if ( false === strpos( $content, '[' ) ) {
 595          return $content;
 596      }
 597  
 598      if ( empty( $shortcode_tags ) || ! is_array( $shortcode_tags ) ) {
 599          return $content;
 600      }
 601  
 602      // Find all registered tag names in $content.
 603      preg_match_all( '@\[([^<>&/\[\]\x00-\x20=]++)@', $content, $matches );
 604  
 605      $tags_to_remove = array_keys( $shortcode_tags );
 606  
 607      /**
 608       * Filters the list of shortcode tags to remove from the content.
 609       *
 610       * @since 4.7.0
 611       *
 612       * @param array  $tags_to_remove Array of shortcode tags to remove.
 613       * @param string $content        Content shortcodes are being removed from.
 614       */
 615      $tags_to_remove = apply_filters( 'strip_shortcodes_tagnames', $tags_to_remove, $content );
 616  
 617      $tagnames = array_intersect( $tags_to_remove, $matches[1] );
 618  
 619      if ( empty( $tagnames ) ) {
 620          return $content;
 621      }
 622  
 623      $content = do_shortcodes_in_html_tags( $content, true, $tagnames );
 624  
 625      $pattern = get_shortcode_regex( $tagnames );
 626      $content = preg_replace_callback( "/$pattern/", 'strip_shortcode_tag', $content );
 627  
 628      // Always restore square braces so we don't break things like <!--[if IE ]>
 629      $content = unescape_invalid_shortcodes( $content );
 630  
 631      return $content;
 632  }
 633  
 634  /**
 635   * Strips a shortcode tag based on RegEx matches against post content.
 636   *
 637   * @since 3.3.0
 638   *
 639   * @param array $m RegEx matches against post content.
 640   * @return string|false The content stripped of the tag, otherwise false.
 641   */
 642  function strip_shortcode_tag( $m ) {
 643      // allow [[foo]] syntax for escaping a tag
 644      if ( $m[1] == '[' && $m[6] == ']' ) {
 645          return substr( $m[0], 1, -1 );
 646      }
 647  
 648      return $m[1] . $m[6];
 649  }


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