這個擴展在PHP 7.4.0中是不支持的，并且是不綁定的。PHP 7.4.0以前默認綁定開啟 * [wddx\_add\_vars](https://www.php.net/manual/en/function.wddx-add-vars.php)—將變量添加到具有指定ID的WDDX數據包 * [wddx\_deserialize](https://www.php.net/manual/en/function.wddx-deserialize.php)—反序列化??WDDX數據包 * [wddx\_packet\_end](https://www.php.net/manual/en/function.wddx-packet-end.php)—結束具有指定ID的WDDX數據包 * [wddx\_packet\_start](https://www.php.net/manual/en/function.wddx-packet-start.php)—啟動一個內部結構新的WDDX數據包 * [wddx\_serialize\_value](https://www.php.net/manual/en/function.wddx-serialize-value.php)—將單個值序列化為WDDX數據包 * [wddx\_serialize\_vars](https://www.php.net/manual/en/function.wddx-serialize-vars.php)—將變量序列化為WDDX數據包 ``` header("Content-Type: text/xml;encoding=utf-8"); echo utf8_decode(wddx_serialize_value("?? ???")); ```