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<sect1 xml:id="language.types.mixed">

<title>Mixed</title>

<para>

<type>mixed</type> 类型接受每个值。等同于<link

linkend="language.types.type-system.composite.union">联合类型</link>

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<type class="union">

<type>object</type><type>resource</type><type>array</type><type>string</type>

<type>int</type><type>float</type><type>bool</type><type>null</type>

</type>.

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<literal>object|resource|array|string|float|int|bool|null</literal>。自 PHP 8.0.0 起可用。

</para>

<para>

在类型理论中，<type>mixed</type> 是顶级类型。这意味着其它所有类型都是它的子类型。

</para>

</sect1>

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