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replace content tags with callback via regex

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  1. /**
  2.  *  Replace all tags matching a regexp with value of callback function
  3.  *  (passes grouped subpatterns to callback as params)
  4.  */
  5. function my_wp_plugin_tag_action($content,$tag,$function,$args = FALSE) {
  6.   // match all regular expressions
  7.   preg_match_all($tag,$content,$matches);
  8.   if (count($matches)>0) {
  9.     // filter duplicates
  10.     $matches = array_unique($matches);
  11.     // loop through
  12.     $tag_results = array();
  13.     $found_tags = array();
  14.     foreach ($matches as $idx => $match) {
  15.       //build arg array
  16.       $full_tag = array_shift($match);
  17.       //call function, adding function output and full tag text to replacement array
  18.       $tag_results[] = my_wp_plugin_buffer_func($function,$match);
  19.       $found_tags[] = $full_tag;
  20.     }
  21.     // replace all tags with corresponding text
  22.     $content = str_replace($found_tags,$tag_results,$content);
  23.   }
  24.   return $content;
  25. }

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