php multibyte wordwrap function that supports sentences.

mb_wordwrap.php

<?php
// Adonis from Chat4All needed a multibyte wordwrap function that support multiple words, 
// So based on some code from php.net I hacked together the following function.
// It's not pretty, but it works. It is supposed to be combined with a simple bbcode parser.

  /*
  * Based on code by Matt at newbiewebdevelopment dot idk
  * http://nl2.php.net/manual/en/function.wordwrap.php#89369
  * Adapted to support multiple words by Filip H.F. "FiXato" Slagter,
  * http://github.com/FiXato
  *
  */
  function mb_wordwrap($string, $width=75, $break="\n", $cut = false) {
    $words = explode(' ',$string);
    foreach($words as &$word) {
      if (!$cut) {
          $regexp = '#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){'.$width.',}\b#U';
      } else {
          $regexp = '#^(?:[\x00-\x7F]|[\xC0-\xFF][\x80-\xBF]+){'.$width.'}#';
      }
      $string_length = mb_strlen($word,'UTF-8');
      $cut_length = ceil($string_length / $width);
      $i = 1;
      $new_word = '';
      while ($i < $cut_length) {
          preg_match($regexp, $word,$matches);
          $new_string = $matches[0];
          $new_word .= $new_string.$break;
          $word = substr($word, strlen($new_string));
          $i++;
      }
      $word = $new_word.$word;
    }
    return join(' ',$words);
  }
?>