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docs/php/dl.html
376
docs/php/dl.html
@@ -1,189 +1,189 @@
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<!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>运行时载入一个 PHP 扩展</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.dl" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">dl</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">dl</span> — <span class="dc-title">运行时载入一个 PHP 扩展</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.dl-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>dl</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$library</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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载入指定参数 <code class="parameter">library</code> 的 PHP 扩展。
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</p>
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<p class="para">
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使用 <span class="function"><a href="extension_loaded.html" class="function">extension_loaded()</a></span> 来测试指定的扩展是否已经激活。
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这既能用于内建的扩展也可以用于动态加载的扩展（既可以通过 <var class="filename">php.ini</var> 也可以通过 <span class="function"><strong>dl()</strong></span>）。
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</p>
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<div class="warning"><strong class="warning">Warning</strong>
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<p class="simpara">
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在 PHP 5.3 里，此函数被某些 SAPI 移除了。
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</p>
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</div>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.dl-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">library</code></dt>
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<dd>
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<p class="para">
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此参数<em class="emphasis">仅仅</em>是要加载的扩展的文件名，依赖于你的平台。
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比如，<a href="ref.sockets.html" class="link">sockets</a>（作为共享模块编译，而不是默认的！）在 Unix 平台上称为 <var class="filename">sockets.so</var> 而 在 Windows 平台上是 <var class="filename">php_sockets.dll</var>。
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</p>
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<p class="para">
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扩展加载的目录依赖于你的平台：
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</p>
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<p class="para">
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Windows - 如果没有在 <var class="filename">php.ini</var> 里明确设置，扩展默认会从 <var class="filename">C:\php5\</var> 加载。
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</p>
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<p class="para">
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Unix - 如果没有在 <var class="filename">php.ini</var> 里明确设置，默认的扩展目录依赖于
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<ul class="itemizedlist">
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<li class="listitem">
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<span class="simpara">
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PHP 是否通过 <em>--enable-debug</em> 选项构建
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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PHP 是否以（实验性质的）ZTS （Zned 线程安全）支持构建
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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当前的内部 <em>ZEND_MODULE_API_NO</em>（Zend 内部模块 API 数字，基本上是主要模块修改时的日期）
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</span>
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</li>
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</ul>
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考虑到上述，目录默认为 <em><install-dir>/lib/php/extensions/ <debug-or-not>-<zts-or-not>-ZEND_MODULE_API_NO</em>，例如
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<var class="filename">/usr/local/php/lib/php/extensions/debug-non-zts-20010901</var>
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或
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<var class="filename">/usr/local/php/lib/php/extensions/no-debug-zts-20010901</var>。
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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.dl-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。 如果加载模块的功能是无效或者禁用的（既可以通过设置关闭 <a href="info.configuration.html#ini.enable-dl" class="link">enable_dl</a> 设置，也可以通过启用 <var class="filename">php.ini</var> 里的 <a href="ini.sect.safe-mode.html#ini.safe-mode" class="link">安全模式</a>）将导致一个 <strong><code>E_ERROR</code></strong> 并中断执行。
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如果因为指定的库无法加载而导致 <span class="function"><strong>dl()</strong></span> 失败，除了返回 <strong><code>FALSE</code></strong>，还会产生一个 <strong><code>E_WARNING</code></strong> 的消息。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.dl-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-491">
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<p><strong>Example #1 <span class="function"><strong>dl()</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">// 加载一个扩展的例子，基于操作系统<br /></span><span style="color: #007700">if (!</span><span style="color: #0000BB">extension_loaded</span><span style="color: #007700">(</span><span style="color: #DD0000">'sqlite'</span><span style="color: #007700">)) {<br /> if (</span><span style="color: #0000BB">strtoupper</span><span style="color: #007700">(</span><span style="color: #0000BB">substr</span><span style="color: #007700">(</span><span style="color: #0000BB">PHP_OS</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">)) === </span><span style="color: #DD0000">'WIN'</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">dl</span><span style="color: #007700">(</span><span style="color: #DD0000">'php_sqlite.dll'</span><span style="color: #007700">);<br /> } else {<br /> </span><span style="color: #0000BB">dl</span><span style="color: #007700">(</span><span style="color: #DD0000">'sqlite.so'</span><span style="color: #007700">);<br /> }<br />}<br /><br /></span><span style="color: #FF8000">// 或者，使用常量 PHP_SHLIB_SUFFIX <br /></span><span style="color: #007700">if (!</span><span style="color: #0000BB">extension_loaded</span><span style="color: #007700">(</span><span style="color: #DD0000">'sqlite'</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">$prefix </span><span style="color: #007700">= (</span><span style="color: #0000BB">PHP_SHLIB_SUFFIX </span><span style="color: #007700">=== </span><span style="color: #DD0000">'dll'</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'php_' </span><span style="color: #007700">: </span><span style="color: #DD0000">''</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">dl</span><span style="color: #007700">(</span><span style="color: #0000BB">$prefix </span><span style="color: #007700">. </span><span style="color: #DD0000">'sqlite.' </span><span style="color: #007700">. </span><span style="color: #0000BB">PHP_SHLIB_SUFFIX</span><span style="color: #007700">);<br />}<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 changelog" id="refsect1-function.dl-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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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>7.0.0</td>
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<td>
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PHP-FPM 模式下已禁用 <span class="function"><strong>dl()</strong></span>。
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</td>
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</tr>
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<tr>
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<td>5.3.9</td>
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<td>
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尽管不推荐，但 PHP-FPM 模式下启用了 <span class="function"><strong>dl()</strong></span>。
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</td>
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</tr>
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<tr>
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<td>5.3.0</td>
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<td>
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由于稳定性，<span class="function"><strong>dl()</strong></span> 在某些 SAPI 中被禁用。仅仅允许 <span class="function"><strong>dl()</strong></span> 的 SAPI 为 CLI 和 Embed。
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使用 <a href="ini.core.html#ini.extension" class="link">扩展加载指令</a> 作为替代。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.dl-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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当 PHP 以支持 ZTS 构建时，<em class="emphasis">不</em>支持 <span class="function"><strong>dl()</strong></span>。
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使用 <a href="ini.core.html#ini.extension" class="link">扩展加载指令</a> 作为替代。
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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在某些 Unix 平台上，<span class="function"><strong>dl()</strong></span> 是大小写敏感的。
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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">当 PHP 运行在 <a href="features.safe_mode.html" class="link">安全模式</a> 时，不能使用此函数。</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.dl-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"><a href="ini.core.html#ini.extension" class="link">扩展加载指令</a></li>
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<li class="member"><span class="function"><a href="extension_loaded.html" class="function" rel="rdfs-seeAlso">extension_loaded()</a> - 检查一个扩展是否已经加载</span></li>
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</ul>
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</p>
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</div>
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<!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>运行时载入一个 PHP 扩展</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.dl" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">dl</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">dl</span> — <span class="dc-title">运行时载入一个 PHP 扩展</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.dl-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>dl</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$library</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
|
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载入指定参数 <code class="parameter">library</code> 的 PHP 扩展。
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</p>
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<p class="para">
|
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使用 <span class="function"><a href="extension_loaded.html" class="function">extension_loaded()</a></span> 来测试指定的扩展是否已经激活。
|
||||
这既能用于内建的扩展也可以用于动态加载的扩展（既可以通过 <var class="filename">php.ini</var> 也可以通过 <span class="function"><strong>dl()</strong></span>）。
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</p>
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<div class="warning"><strong class="warning">Warning</strong>
|
||||
<p class="simpara">
|
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在 PHP 5.3 里，此函数被某些 SAPI 移除了。
|
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</p>
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</div>
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</div>
|
||||
|
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<div class="refsect1 parameters" id="refsect1-function.dl-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
|
||||
<dl>
|
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|
||||
|
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<dt>
|
||||
<code class="parameter">library</code></dt>
|
||||
|
||||
<dd>
|
||||
|
||||
<p class="para">
|
||||
此参数<em class="emphasis">仅仅</em>是要加载的扩展的文件名，依赖于你的平台。
|
||||
比如，<a href="ref.sockets.html" class="link">sockets</a>（作为共享模块编译，而不是默认的！）在 Unix 平台上称为 <var class="filename">sockets.so</var> 而 在 Windows 平台上是 <var class="filename">php_sockets.dll</var>。
|
||||
</p>
|
||||
<p class="para">
|
||||
扩展加载的目录依赖于你的平台：
|
||||
</p>
|
||||
<p class="para">
|
||||
Windows - 如果没有在 <var class="filename">php.ini</var> 里明确设置，扩展默认会从 <var class="filename">C:\php5\</var> 加载。
|
||||
</p>
|
||||
<p class="para">
|
||||
Unix - 如果没有在 <var class="filename">php.ini</var> 里明确设置，默认的扩展目录依赖于
|
||||
<ul class="itemizedlist">
|
||||
<li class="listitem">
|
||||
<span class="simpara">
|
||||
PHP 是否通过 <em>--enable-debug</em> 选项构建
|
||||
</span>
|
||||
</li>
|
||||
<li class="listitem">
|
||||
<span class="simpara">
|
||||
PHP 是否以（实验性质的）ZTS （Zned 线程安全）支持构建
|
||||
</span>
|
||||
</li>
|
||||
<li class="listitem">
|
||||
<span class="simpara">
|
||||
当前的内部 <em>ZEND_MODULE_API_NO</em>（Zend 内部模块 API 数字，基本上是主要模块修改时的日期）
|
||||
</span>
|
||||
</li>
|
||||
</ul>
|
||||
考虑到上述，目录默认为 <em><install-dir>/lib/php/extensions/ <debug-or-not>-<zts-or-not>-ZEND_MODULE_API_NO</em>，例如
|
||||
<var class="filename">/usr/local/php/lib/php/extensions/debug-non-zts-20010901</var>
|
||||
或
|
||||
<var class="filename">/usr/local/php/lib/php/extensions/no-debug-zts-20010901</var>。
|
||||
</p>
|
||||
</dd>
|
||||
|
||||
|
||||
</dl>
|
||||
|
||||
</p>
|
||||
</div>
|
||||
|
||||
|
||||
<div class="refsect1 returnvalues" id="refsect1-function.dl-returnvalues">
|
||||
<h3 class="title">返回值</h3>
|
||||
<p class="para">
|
||||
成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。 如果加载模块的功能是无效或者禁用的（既可以通过设置关闭 <a href="info.configuration.html#ini.enable-dl" class="link">enable_dl</a> 设置，也可以通过启用 <var class="filename">php.ini</var> 里的 <a href="ini.sect.safe-mode.html#ini.safe-mode" class="link">安全模式</a>）将导致一个 <strong><code>E_ERROR</code></strong> 并中断执行。
|
||||
如果因为指定的库无法加载而导致 <span class="function"><strong>dl()</strong></span> 失败，除了返回 <strong><code>FALSE</code></strong>，还会产生一个 <strong><code>E_WARNING</code></strong> 的消息。
|
||||
</p>
|
||||
</div>
|
||||
|
||||
|
||||
<div class="refsect1 examples" id="refsect1-function.dl-examples">
|
||||
<h3 class="title">范例</h3>
|
||||
<p class="para">
|
||||
<div class="example" id="example-491">
|
||||
<p><strong>Example #1 <span class="function"><strong>dl()</strong></span> 例子</strong></p>
|
||||
<div class="example-contents">
|
||||
<div class="phpcode"><pre><span style="color: #000000">
|
||||
<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// 加载一个扩展的例子，基于操作系统<br /></span><span style="color: #007700">if (!</span><span style="color: #0000BB">extension_loaded</span><span style="color: #007700">(</span><span style="color: #DD0000">'sqlite'</span><span style="color: #007700">)) {<br /> if (</span><span style="color: #0000BB">strtoupper</span><span style="color: #007700">(</span><span style="color: #0000BB">substr</span><span style="color: #007700">(</span><span style="color: #0000BB">PHP_OS</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">)) === </span><span style="color: #DD0000">'WIN'</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">dl</span><span style="color: #007700">(</span><span style="color: #DD0000">'php_sqlite.dll'</span><span style="color: #007700">);<br /> } else {<br /> </span><span style="color: #0000BB">dl</span><span style="color: #007700">(</span><span style="color: #DD0000">'sqlite.so'</span><span style="color: #007700">);<br /> }<br />}<br /><br /></span><span style="color: #FF8000">// 或者，使用常量 PHP_SHLIB_SUFFIX <br /></span><span style="color: #007700">if (!</span><span style="color: #0000BB">extension_loaded</span><span style="color: #007700">(</span><span style="color: #DD0000">'sqlite'</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">$prefix </span><span style="color: #007700">= (</span><span style="color: #0000BB">PHP_SHLIB_SUFFIX </span><span style="color: #007700">=== </span><span style="color: #DD0000">'dll'</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'php_' </span><span style="color: #007700">: </span><span style="color: #DD0000">''</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">dl</span><span style="color: #007700">(</span><span style="color: #0000BB">$prefix </span><span style="color: #007700">. </span><span style="color: #DD0000">'sqlite.' </span><span style="color: #007700">. </span><span style="color: #0000BB">PHP_SHLIB_SUFFIX</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?></span>
|
||||
</span>
|
||||
</pre></div>
|
||||
</div>
|
||||
|
||||
</div>
|
||||
</p>
|
||||
</div>
|
||||
|
||||
|
||||
<div class="refsect1 changelog" id="refsect1-function.dl-changelog">
|
||||
<h3 class="title">更新日志</h3>
|
||||
<p class="para">
|
||||
<table class="doctable informaltable">
|
||||
|
||||
<thead>
|
||||
<tr>
|
||||
<th>版本</th>
|
||||
<th>说明</th>
|
||||
</tr>
|
||||
|
||||
</thead>
|
||||
|
||||
<tbody class="tbody">
|
||||
<tr>
|
||||
<td>7.0.0</td>
|
||||
<td>
|
||||
PHP-FPM 模式下已禁用 <span class="function"><strong>dl()</strong></span>。
|
||||
</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td>5.3.9</td>
|
||||
<td>
|
||||
尽管不推荐，但 PHP-FPM 模式下启用了 <span class="function"><strong>dl()</strong></span>。
|
||||
</td>
|
||||
</tr>
|
||||
|
||||
<tr>
|
||||
<td>5.3.0</td>
|
||||
<td>
|
||||
由于稳定性，<span class="function"><strong>dl()</strong></span> 在某些 SAPI 中被禁用。仅仅允许 <span class="function"><strong>dl()</strong></span> 的 SAPI 为 CLI 和 Embed。
|
||||
使用 <a href="ini.core.html#ini.extension" class="link">扩展加载指令</a> 作为替代。
|
||||
</td>
|
||||
</tr>
|
||||
|
||||
</tbody>
|
||||
|
||||
</table>
|
||||
|
||||
</p>
|
||||
</div>
|
||||
|
||||
|
||||
<div class="refsect1 notes" id="refsect1-function.dl-notes">
|
||||
<h3 class="title">注释</h3>
|
||||
<blockquote class="note"><p><strong class="note">Note</strong>:
|
||||
<p class="para">
|
||||
当 PHP 以支持 ZTS 构建时，<em class="emphasis">不</em>支持 <span class="function"><strong>dl()</strong></span>。
|
||||
使用 <a href="ini.core.html#ini.extension" class="link">扩展加载指令</a> 作为替代。
|
||||
</p>
|
||||
</p></blockquote>
|
||||
<blockquote class="note"><p><strong class="note">Note</strong>:
|
||||
<p class="para">
|
||||
在某些 Unix 平台上，<span class="function"><strong>dl()</strong></span> 是大小写敏感的。
|
||||
</p>
|
||||
</p></blockquote>
|
||||
<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">当 PHP 运行在 <a href="features.safe_mode.html" class="link">安全模式</a> 时，不能使用此函数。</span></p></blockquote>
|
||||
</div>
|
||||
|
||||
|
||||
<div class="refsect1 seealso" id="refsect1-function.dl-seealso">
|
||||
<h3 class="title">参见</h3>
|
||||
<p class="para">
|
||||
<ul class="simplelist">
|
||||
<li class="member"><a href="ini.core.html#ini.extension" class="link">扩展加载指令</a></li>
|
||||
<li class="member"><span class="function"><a href="extension_loaded.html" class="function" rel="rdfs-seeAlso">extension_loaded()</a> - 检查一个扩展是否已经加载</span></li>
|
||||
</ul>
|
||||
</p>
|
||||
</div>
|
||||
|
||||
|
||||
</div></div></div></body></html>
|
||||
Reference in New Issue
Block a user