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67 lines
1.7 KiB
XML
67 lines
1.7 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: e587d0655e426f97b3fcb431453da5030e743b23 Maintainer: daijie Status: ready -->
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<!-- CREDITS: mowangjuanzi, Luffy -->
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<sect1 xml:id="language.types.iterable">
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<title>Iterable 可迭代对象</title>
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<para>
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<type>Iterable</type> 是内置编译时 <literal>array|Traversable</literal>
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<!-- Need to improve rendering of free-standing type elements in PhD
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<type class="union"><type>array</type><type>Traversable</type></type>.
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-->
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的类型别名。从 PHP 7.1.0 到 PHP 8.2.0 之间的描述来看，<type>iterable</type>
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是内置伪类型，充当上述类型别名，也可以用于类型声明。iterable 类型可用于 &foreach;
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或在<link linkend="language.generators">生成器</link>中使用 <command>yield from</command>。
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</para>
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<note>
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<para>
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将可迭代对象声明为返回类型的函数也可能是 <link
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linkend="language.generators">生成器</link>。
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<example>
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<title>
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可迭代生成器返回类型的示例
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</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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function gen(): iterable {
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yield 1;
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yield 2;
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yield 3;
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}
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foreach(gen() as $value) {
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echo $value, "\n";
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}
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</note>
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</sect1>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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