137     /**

   138      * From http://stackoverflow.com/a/834355

   139      */

   140     public static function startsWith($haystack, $needle)

   141     {

   142         $length = strlen($needle);

   143         return (substr($haystack, 0, $length) === $needle);

   144     }

   145 

   146     /**

   147      * From http://stackoverflow.com/a/834355

   148      */

   149     public static function endsWith($haystack, $needle)

   150     {

   151         $length = strlen($needle);

   152         if ($length == 0) {

   153             return true;

   154         }

   155 

   156         return (substr($haystack, -$length) === $needle);

   157     }

   158