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157 lines
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157 lines
6.6 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>获取一个环境变量的值</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.getenv" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">getenv</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">getenv</span> — <span class="dc-title">获取一个环境变量的值</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.getenv-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>getenv</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$varname</code></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$local_only</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span>
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] ) : <span class="type">string</span></div>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>getenv</strong></span>
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( <span class="methodparam">void</span>
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) : <span class="type">array</span></div>
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<p class="para rdfs-comment">
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获取一个环境变量的值。
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</p>
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<p class="para">
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使用 <span class="function"><a href="phpinfo.html" class="function">phpinfo()</a></span> 你可以看到所有环境变量的列表。
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这些变量很多都在 <a href="http://www.faqs.org/rfcs/rfc3875" class="link external">» RFC 3875</a> 的范围之内，
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尤其是章节4.1，"Request Meta-Variables"。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.getenv-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">varname</code></dt>
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<dd>
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<p class="para">
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变量名。
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</p>
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</dd>
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<dt>
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<code class="parameter">local_only</code></dt>
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<dd>
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<p class="para">
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设置为 true 以仅返回本地环境变量（由操作系统或 <span class="function"><a href="putenv.html" class="function">putenv()</a></span> 设置）。
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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.getenv-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回环境变量 <code class="parameter">varname</code> 的值，
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如果环境变量 <code class="parameter">varname</code> 不存在则返回 <strong><code>FALSE</code></strong>。
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如果省略 <code class="parameter">varname</code>，则所有环境变量都将作为关联数组 <span class="type"><a href="language.types.array.html" class="type array">array</a></span> 返回。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.getenv-changelog">
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<h3 class="title">更新日志</h3>
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>7.1.0</td>
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<td>
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现在可以省略 <code class="parameter">varname</code> 来检索所有环境变量的关联数组 <span class="type"><a href="language.types.array.html" class="type array">array</a></span>。
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</td>
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</tr>
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<tr>
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<td>5.5.38, 5.6.24, 7.0.9</td>
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<td>
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添加 <code class="parameter">local_only</code> 参数。
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="refsect1 notes" id="refsect1-function.getenv-notes">
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<h3 class="title">注释</h3>
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<div class="warning"><strong class="warning">Warning</strong>
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<p class="para">
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如果 PHP 在诸如 Fast CGI 之类的 SAPI 中运行，则此函数将始终返回由 SAPI 设置的环境变量的值，即使已使用 <span class="function"><a href="putenv.html" class="function">putenv()</a></span> 来设置同名的本地环境变量。使用 <code class="parameter">local_only</code> 参数返回本地设置的环境变量的值。
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</p>
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</div>
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</div>
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<div class="refsect1 examples" id="refsect1-function.getenv-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-505">
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<p><strong>Example #1 <span class="function"><strong>getenv()</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 /></span><span style="color: #FF8000">// getenv() 使用示例<br /></span><span style="color: #0000BB">$ip </span><span style="color: #007700">= </span><span style="color: #0000BB">getenv</span><span style="color: #007700">(</span><span style="color: #DD0000">'REMOTE_ADDR'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 或简单仅使用全局变量（$_SERVER 或 $_ENV）<br /></span><span style="color: #0000BB">$ip </span><span style="color: #007700">= </span><span style="color: #0000BB">$_SERVER</span><span style="color: #007700">[</span><span style="color: #DD0000">'REMOTE_ADDR'</span><span style="color: #007700">];<br /><br /></span><span style="color: #FF8000">// 安全地获取环境变量，忽略通过 SAPI 或 putenv 修改的值<br /></span><span style="color: #0000BB">$ip </span><span style="color: #007700">= </span><span style="color: #0000BB">getenv</span><span style="color: #007700">(</span><span style="color: #DD0000">'REMOTE_ADDR'</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">) ?: </span><span style="color: #0000BB">getenv</span><span style="color: #007700">(</span><span style="color: #DD0000">'REMOTE_ADDR'</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 seealso" id="refsect1-function.getenv-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="putenv.html" class="function" rel="rdfs-seeAlso">putenv()</a> - 设置环境变量的值</span></li>
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<li class="member"><span class="function"><a href="apache_getenv.html" class="function" rel="rdfs-seeAlso">apache_getenv()</a> - 获取 Apache subprocess_env 变量</span></li>
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<li class="member"><a href="language.variables.superglobals.html" class="link">超全局变量</a></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> |