forkort tekst uden at "klippe" i html-tags

Jeg har fundet det her script der virker ganske fint der kan forkorte ens tekst og samtidig tage højde for at den ikke "klipper" mit i et HTML-tag.. men det virker kun i XHTML... :/

Nogle der har en god idé til hvordan det kunne bygges op så den også virker i HTML?


scriptet:

<?php
function a_shortentext($posttext, $minimum_length = 200, $length_offset = 20, $cut_words = FALSE, $dots = TRUE) {
  // $minimum_length:
  // The approximate length you want the concatenated text to be 


  // $length_offset:
  // The variation in how long the text can be in this example text
  // length will be between 200 and 200-20=180 characters and the
  // character where the last tag ends

  // Reset tag counter & quote checker
  $tag_counter = 0;
  $quotes_on = FALSE;
  // Check if the text is too long
  if (strlen($posttext) > $minimum_length) {
      // Reset the tag_counter and pass through (part of) the entire text
      $c = 0;
      for ($i = 0; $i < strlen($posttext); $i++) {
          // Load the current character and the next one
          // if the string has not arrived at the last character
          $current_char = substr($posttext,$i,1);
          if ($i < strlen($posttext) - 1) {
              $next_char = substr($posttext,$i + 1,1);
          }
          else {
              $next_char = "";
          }
          // First check if quotes are on
          if (!$quotes_on) {
              // Check if it's a tag
              // On a "<" add 3 if it's an opening tag (like <a href...)
              // or add only 1 if it's an ending tag (like </a>)
              if ($current_char == '<') {
                  if ($next_char == '/') {
                      $tag_counter += 1;
                  }
                  else {
                      $tag_counter += 3;
                  }
              }
              // Slash signifies an ending (like </a> or ... />)
              // substract 2
              if ($current_char == '/' && $tag_counter <> 0) $tag_counter -= 2;
              // On a ">" substract 1
              if ($current_char == '>') $tag_counter -= 1;
              // If quotes are encountered, start ignoring the tags
              // (for directory slashes)
              if ($current_char == '"') $quotes_on = TRUE;
          }
          else {
              // IF quotes are encountered again, turn it back off
              if ($current_char == '"') $quotes_on = FALSE;
          }
         
          // Count only the chars outside html tags
          if($tag_counter == 2 || $tag_counter == 0){
              $c++;
          }         
                         
          // Check if the counter has reached the minimum length yet,
          // then wait for the tag_counter to become 0, and chop the string there
          if ($c > $minimum_length - $length_offset && $tag_counter == 0 && ($next_char == ' ' || $cut_words == TRUE)) {
              $posttext = substr($posttext,0,$i + 1);             
              if($dots){
                  $posttext .= '...';
              }
              return $posttext;
          }
      }
  } 
  return $posttext;

}
?>