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137 lines
7.3 KiB
HTML
137 lines
7.3 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>打开进程文件指针</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.popen" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">popen</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">popen</span> — <span class="dc-title">打开进程文件指针</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.popen-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>popen</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$command</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$mode</code></span>
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) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">
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打开一个指向进程的管道，该进程由派生给定的 command 命令执行而产生。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.popen-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">command</code></dt>
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<dd>
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<p class="para">
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命令。
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</p>
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</dd>
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<dt>
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<code class="parameter">mode</code></dt>
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<dd>
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<p class="para">
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模式。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.popen-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回一个和 <span class="function"><a href="fopen.html" class="function">fopen()</a></span>
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所返回的相同的文件指针，只不过它是单向的（只能用于读或写）并且必须用
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<span class="function"><a href="pclose.html" class="function">pclose()</a></span> 来关闭。此指针可以用于
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<span class="function"><a href="fgets.html" class="function">fgets()</a></span>，<span class="function"><a href="fgetss.html" class="function">fgetss()</a></span> 和
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<span class="function"><a href="fwrite.html" class="function">fwrite()</a></span>。
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当模式为 'r'，返回的文件指针等于命令的 STDOUT，当模式为 'w'，返回的文件指针等于命令的 STDIN。
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</p>
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<p class="para">
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如果出错返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.popen-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-2833">
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<p><strong>Example #1 <span class="function"><strong>popen()</strong></span> 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$handle </span><span style="color: #007700">= </span><span style="color: #0000BB">popen</span><span style="color: #007700">(</span><span style="color: #DD0000">"/bin/ls"</span><span style="color: #007700">, </span><span style="color: #DD0000">"r"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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如果未找到要执行的命令，会返回一个合法的资源。这看上去很怪，但有道理。它允许访问
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shell 返回的任何错误信息：
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<div class="example" id="example-2834">
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<p><strong>Example #2 <span class="function"><strong>popen()</strong></span> 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />error_reporting</span><span style="color: #007700">(</span><span style="color: #0000BB">E_ALL</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* 加入重定向以得到标准错误输出 stderr。 */<br /></span><span style="color: #0000BB">$handle </span><span style="color: #007700">= </span><span style="color: #0000BB">popen</span><span style="color: #007700">(</span><span style="color: #DD0000">'/path/to/executable 2>&1'</span><span style="color: #007700">, </span><span style="color: #DD0000">'r'</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"'</span><span style="color: #0000BB">$handle</span><span style="color: #DD0000">'; " </span><span style="color: #007700">. </span><span style="color: #0000BB">gettype</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$read </span><span style="color: #007700">= </span><span style="color: #0000BB">fread</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">, </span><span style="color: #0000BB">2096</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">$read</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">pclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$handle</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.popen-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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如果需要双向支持，使用 <span class="function"><a href="proc_open.html" class="function">proc_open()</a></span>。
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara"><a href="features.safe_mode.html" class="link">安全模式</a> 启用时，可仅可用
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<a href="ini.sect.safe-mode.html#ini.safe-mode-exec-dir" class="link">safe_mode_exec_dir</a> 执行文件。实际上，现在不允许在到可执行的路径中存在 <em>..</em> 组件。</span></p></blockquote>
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<div class="warning"><strong class="warning">Warning</strong><p class="simpara"><a href="features.safe_mode.html" class="link">安全模式</a> 启用时，命令字符串会被
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<span class="function"><a href="escapeshellcmd.html" class="function">escapeshellcmd()</a></span> 转换。因此，<em>echo y | echo x</em> 会变成
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<em>echo y \| echo x</em>。</p></div>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.popen-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="pclose.html" class="function" rel="rdfs-seeAlso">pclose()</a> - 关闭进程文件指针</span></li>
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<li class="member"><span class="function"><a href="fopen.html" class="function" rel="rdfs-seeAlso">fopen()</a> - 打开文件或者 URL</span></li>
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<li class="member"><span class="function"><a href="proc_open.html" class="function" rel="rdfs-seeAlso">proc_open()</a> - 执行一个命令，并且打开用来输入/输出的文件指针。</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |