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archived-doc-zh/language/types/void.xml
2022-12-19 16:54:35 +08:00

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<?xml version="1.0" encoding="utf-8"?>
<!-- EN-Revision: 161dde4fe721309398dd324edbf02aec409f127b Maintainer: mowangjuanzi Status: ready -->
<sect1 xml:id="language.types.void">
<title>Void</title>
<para>
<type>void</type> 是仅用于返回类型,表示函数不返回值,但该函数仍可能会终止。因此,它不能成为<link
linkend="language.types.type-system.composite.union">联合类型</link>声明的一部分。自 PHP 7.1.0 起可用。
</para>
<note>
<simpara>
即使函数的返回类型是 <type>void</type>,但仍然可以返回值,但值只能始终为 &null;
</simpara>
</note>
</sect1>
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