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* Delete entities.functions.xml * Update escapeshellarg.xml * Update escapeshellcmd.xml * Update exec.xml * Update proc-close.xml * Update proc-get-status.xml * Update proc-get-status.xml * Update proc-nice.xml * Update proc-terminate.xml * Update shell-exec.xml * Update system.xml * Update exec.xml * Update proc-open.xml * Update escapeshellarg.xml * Update escapeshellcmd.xml * Update exec.xml * Update proc-get-status.xml * Update proc-nice.xml * Update proc-terminate.xml * Update proc-terminate.xml * Update shell-exec.xml * Update system.xml
132 lines
3.7 KiB
XML
132 lines
3.7 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 0c9c2dd669fe9395eaa73d487fbd160f9057429a Maintainer: yuanyuqiang Status: ready -->
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<!-- CREDITS: mowangjuanzi -->
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<!-- splitted from ./en/functions/exec.xml, last change in rev 1.24 -->
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<refentry xml:id="function.system" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>system</refname>
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<refpurpose>执行外部程序，并且显示输出</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type class="union"><type>string</type><type>false</type></type><methodname>system</methodname>
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<methodparam><type>string</type><parameter>command</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter role="reference">result_code</parameter><initializer>&null;</initializer></methodparam>
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</methodsynopsis>
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<para>
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同 C 版本的 <function>system</function> 函数一样，本函数执行
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<parameter>command</parameter> 参数所指定的命令，并且输出执行结果。
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</para>
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<para>
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如果 PHP 运行在服务器模块中，<function>system</function>
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函数还会尝试在每行输出完毕之后，自动刷新 web 服务器的输出缓存。
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</para>
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<para>
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如果要获取一个命令未经任何处理的原始输出，请使用
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<function>passthru</function> 函数。
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>command</parameter></term>
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<listitem>
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<para>
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要执行的命令。
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>result_code</parameter></term>
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<listitem>
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<para>
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如果提供 <parameter>result_code</parameter>
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参数，则外部命令执行后的返回状态将会被设置到此变量中。
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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成功则返回命令输出的最后一行，失败则返回 &false;
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title><function>system</function> 示例</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo '<pre>';
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// 输出 shell 命令 "ls" 的返回结果
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// 并且将输出的最后一样内容返回到 $last_line。
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// 将命令的返回值保存到 $retval。
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$last_line = system('ls', $retval);
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// 打印更多信息
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echo '
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</pre>
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<hr />Last line of the output: ' . $last_line . '
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<hr />Return value: ' . $retval;
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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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</refsect1>
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<refsect1 role="notes">
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&reftitle.notes;
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&warn.escapeshell;
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¬e.exec-bg;
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>exec</function></member>
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<member><function>passthru</function></member>
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<member><function>popen</function></member>
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<member><function>escapeshellcmd</function></member>
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<member><function>pcntl_exec</function></member>
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<member><link linkend="language.operators.execution">执行运算符</link></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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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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