Common.class.php

<?php
class Common
{
  public static function createSlug($text)
  {
    $text = strtolower($text);

    // strip all non word chars
    $text = preg_replace('/\W/', ' ', $text);

    // replace all white space sections with a dash
    $text = preg_replace('/\ +/', '-', $text);

    // trim dashes
    $text = preg_replace('/\-$/', '', $text);
    $text = preg_replace('/^\-/', '', $text);

    return $text;
  }
}