Customizer::reduceArray PHP Method

    private function reduceArray($array, $keys, $i = 0)
    {
        if (is_array($array) and isset($keys[$i])) {
            return isset($array[$keys[$i]]) ? $this->reduceArray($array[$keys[$i]], $keys, $i + 1) : NULL;
        }
        return $array === '' ? NULL : $array;
    }