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70 lines
1.9 KiB
XML
70 lines
1.9 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- EN-Revision: eb8957c4fd67d7bd458140e1bc0588834ab49b3e Maintainer: mowangjuanzi Status: ready -->
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<!-- CREDITS: Luffy -->
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<sect1 xml:id="language.operators.execution">
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<title>执行运算符</title>
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<titleabbrev>执行</titleabbrev>
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<para>
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PHP 支持一个执行运算符：反引号（<literal>``</literal>）。注意这不是单引号！PHP
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将尝试将反引号中的内容作为 shell 命令来执行，并将其输出信息返回（即，可以赋给一个变量而不是简单地丢弃到标准输出）。使用反引号运算符“`”的效果与函数
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<function>shell_exec</function> 相同。
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</para>
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<para>
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<example>
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<title>反引号运算符</title>
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<programlisting role="php" annotations="non-interactive">
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<![CDATA[
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<?php
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$output = `ls -al`;
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echo "<pre>$output</pre>";
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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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<para>
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关闭了 <function>shell_exec</function> 时反引号运算符是无效的。
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</para>
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</note>
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<note>
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<para>
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与其它某些语言不同，反引号不能在双引号字符串中使用。
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</para>
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</note>
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<sect2 role="changelog">
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&reftitle.changelog;
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>8.5.0</entry>
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<entry>
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已弃用将反引号运算符作为 <function>shell_exec</function> 的别名。
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</sect2>
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<sect2 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><link linkend="ref.exec">程序执行函数</link></member>
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<member><function>popen</function></member>
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<member><function>proc_open</function></member>
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<member><link linkend="features.commandline">PHP 的命令行模式</link></member>
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</simplelist>
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</para>
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</sect2>
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</sect1>
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