protected function _recursiveTraveler($function, $methodAttributes, $data)
    {
        foreach ($data as $key => $value) {
            if (is_array($value)) {
                $data[$key] = $this->_recursiveTraveler($function, $methodAttributes, $value);
            } else {
                $data[$key] = $this->_callUserFunction($function, $key, $value, $methodAttributes);
            }
        }

        return $data;
    }