lib.php

<?php

/** 
 * close all open xhtml tags at the end of the string
 * @param string $html
 * @return string
 * @author Milian <mail@mili.de>
 */
 
function closetags($html) {
   #put all opened tags into an array
   preg_match_all('#<([a-z]+)(?: .*)?(?<![/|/ ])>#iU', $html, $result);
   $openedtags = $result[1]; 
   
   #put all closed tags into an array
   preg_match_all('#</([a-z]+)>#iU', $html, $result);
   $closedtags = $result[1];

   $len_opened = count($openedtags);
   
   # all tags are closed
   if (count($closedtags) == $len_opened)
      return $html;
   
   $openedtags = array_reverse($openedtags);
   
   # close tags
   for ($i=0; $i < $len_opened; $i++) {
      if (!in_array($openedtags[$i], $closedtags))
         $html .= '</'.$openedtags[$i].'>';
      else
         unset($closedtags[array_search($openedtags[$i], $closedtags)]);
   }
   
   return $html;
}