protected function hasIn($key, $in)
    {
        $keys = explode($this->getSeparator(), $key, 2);
        if (count($keys) <= 0) {
            return false;
        } else {
            if (! isset($in[$keys[0]])) {
                return false;
            } else {
                if (count($keys) >= 2) {
                    return true && $this->hasIn($keys[1], $in[$keys[0]]);
                } else {
                    return true;
                }
            }
        }
    }