public function toKeyValue(array $values)
    {
        $result = [];

        foreach ($values as $key => $value) {
            if (is_array($value)) {
                $result[$key] = $this->toKeyValue($value);
            } elseif (is_object($value)) {
                $result[$key] = $this->toKeyValue((array) $value);
            } else {
                $result[$key] = $value;
            }
        }

        return $result;
    }