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// string CloseOpenTags(string string [, string beginChar [, stringEndChar [, string CloseChar]]]);
function closeOpenTags($str, $open = "<", $close = ">", $end = "/", $tokens = "_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
{
  $chars = array();
  for($i = 0; $i < strlen($tokens); $i++)
  {
    $chars[] = substr($tokens, $i, 1); }

    $openedTags = array();
    $closedTags = array();
    $tag = FALSE;
    $closeTag = FALSE;
    $tagName = "";

    for ($i = 0; $i < strlen($str); $i++)
     {
     	$char = substr($str, $i, 1);
        if($char == $open) { $tag      = TRUE; continue; }
        if($char == $end)  { $closeTag = TRUE; continue; }
        if($tag && in_array($char, $chars)) { $tagName .= $char; }
        else {
          if($closeTag) {
           if(isset($closedTags[$tagName])) { $closedTags[$tagName]++;   }
           else                             { $closedTags[$tagName] = 1; }
          }
          elseif($tag)
          {
            if(isset($openedTags[$tagName])) { $openedTags[$tagName]++;   }
            else                             { $openedTags[$tagName] = 1; }
          }
         $tag = FALSE; $closeTag = FALSE; $tagName = "";
        }
     }

     while(list($tag, $count) = each($openedTags))
     {
      $closedTags[$tag] = isset($closedTags[$tag]) ? $closedTags[$tag]:0;
      $count -= $closedTags[$tag];
      if($count < 1) continue;
      $str .= str_repeat($open.$end.$tag.$close, $count);
     }

  return $str;
}