public function _getPrev(&$tokens, $key, $whatToGet)
    {
        $key--;
        if (!is_array($whatToGet)) $whatToGet = array($whatToGet);
        while (!is_array($tokens[$key]) || !in_array($tokens[$key][0], $whatToGet)) {
            $key--;
            if (!isset($tokens[$key])) return FALSE;
        }

        return $tokens[$key][1];
    }