fXmlRpc\Serializer\NativeSerializer::convert PHP Method

    private function convert(array $params)
    {
        foreach ($params as $key => $value) {
            $type = gettype($value);
            if ($type === 'array') {
                $params[$key] = $this->convert($value);
            } elseif ($type === 'object') {
                if ($value instanceof DateTime) {
                    $params[$key] = (object) ['xmlrpc_type' => 'datetime', 'scalar' => $value->format('Ymd\\TH:i:s'), 'timestamp' => $value->format('u')];
                } elseif ($value instanceof Base64Interface) {
                    $params[$key] = (object) ['xmlrpc_type' => 'base64', 'scalar' => $value->getDecoded()];
                } else {
                    $params[$key] = get_object_vars($value);
                }
            } elseif ($type === 'resource') {
                throw SerializationException::invalidType($value);
            }
        }
        return $params;
    }