Linkifies a text. Will use the `truncate_text` function of Symfony's Text helper.

TextUtilsHelper.php

<?php
/**
 * Linkifies a text. Will use the `truncate_text` function of Symfony's Text helper. 
 *
 * I'm not really proud of it, but eh, it works™.
 *
 * @param  string   $text       Initial text
 * @param  int      $maxLength  Max link caption length
 * @param  Boolean  $nofollow   Add rel="nofollow" to generated links
 *
 * @return string
 */
function linkify($text, $maxLength = 45, $nofollow = true)
{
  return preg_replace('@(https?://([-\w\.]+)+(:\d+)?(/([\w/_\.]*(\?\S+)?)?)?)@e',
                      sprintf("'<a href=\"\\1\"%s>'.truncate_text('\\1', %d).'</a>'", ($nofollow ? ' rel="nofollow"' : ''), $maxLength), 
                      $text);
}