# WDDX 这个扩展在PHP 7.4.0中是不支持的，并且是不绑定的。PHP 7.4.0以前默认绑定开启 - [wddx\_add\_vars](https://www.php.net/manual/en/function.wddx-add-vars.php)—将变量添加到具有指定ID的WDDX数据包 - [wddx\_deserialize](https://www.php.net/manual/en/function.wddx-deserialize.php)—反序列化WDDX数据包 - [wddx\_packet\_end](https://www.php.net/manual/en/function.wddx-packet-end.php)—结束具有指定ID的WDDX数据包 - [wddx\_packet\_start](https://www.php.net/manual/en/function.wddx-packet-start.php)—启动一个内部结构新的WDDX数据包 - [wddx\_serialize\_value](https://www.php.net/manual/en/function.wddx-serialize-value.php)—将单个值序列化为WDDX数据包 - [wddx\_serialize\_vars](https://www.php.net/manual/en/function.wddx-serialize-vars.php)—将变量序列化为WDDX数据包 ``` <pre class="calibre17">``` <span class="token4">header</span><span class="token3">(</span><span class="token2">"Content-Type: text/xml;encoding=utf-8"</span><span class="token3">)</span><span class="token3">;</span> echo <span class="token4">utf8_decode</span><span class="token3">(</span><span class="token4">wddx_serialize_value</span><span class="token3">(</span><span class="token2">"안녕 하세요"</span><span class="token3">)</span><span class="token3">)</span><span class="token3">;</span> ``` ```