public static function stristr($str, $search)
    {
        if (strlen($search) === 0) {
            return $str;
        }

        $lstr = AnHelperString::strtolower($str);
        $lsearch = AnHelperString::strtolower($search);
        preg_match('|^(.*)'.preg_quote($lsearch).'|Us', $lstr, $matches);

        if (count($matches) === 2) {
            return substr($str, strlen($matches[1]));
        }

        return false;
    }