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113 lines
4.5 KiB
HTML
113 lines
4.5 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>检查一个扩展是否已经加载</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.extension-loaded" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">extension_loaded</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">extension_loaded</span> — <span class="dc-title">检查一个扩展是否已经加载</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.extension-loaded-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>extension_loaded</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$name</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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检查一个扩展是否已经加载。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.extension-loaded-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">name</code></dt>
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<dd>
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<p class="para">
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扩展名称，大小写不敏感。
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</p>
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<p class="para">
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你可以用 <span class="function"><a href="phpinfo.html" class="function">phpinfo()</a></span> 来查看一系列扩展名称，而在 <em>CGI</em> 或 <em>CLI</em> 的 PHP 版本里你可以使用 <strong class="option unknown">-m</strong>
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参数来列出所有有效的扩展：
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<div class="example-contents screen">
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<div class="cdata"><pre>
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$ php -m
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[PHP Modules]
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xml
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tokenizer
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standard
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sockets
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session
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posix
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pcre
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overload
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mysql
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mbstring
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ctype
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[Zend Modules]
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</pre></div>
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</div>
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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.extension-loaded-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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如果 <code class="parameter">name</code> 指定的扩展已加载，返回<strong><code>TRUE</code></strong>，否则返回 <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.extension-loaded-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-492">
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<p><strong>Example #1 <span class="function"><strong>extension_loaded()</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: #007700">if (!</span><span style="color: #0000BB">extension_loaded</span><span style="color: #007700">(</span><span style="color: #DD0000">'gd'</span><span style="color: #007700">)) {<br /> if (!</span><span style="color: #0000BB">dl</span><span style="color: #007700">(</span><span style="color: #DD0000">'gd.so'</span><span style="color: #007700">)) {<br /> exit;<br /> }<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 seealso" id="refsect1-function.extension-loaded-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="get_loaded_extensions.html" class="function" rel="rdfs-seeAlso">get_loaded_extensions()</a> - 返回所有编译并加载模块名的 array</span></li>
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<li class="member"><span class="function"><a href="get_extension_funcs.html" class="function" rel="rdfs-seeAlso">get_extension_funcs()</a> - 返回模块函数名称的数组</span></li>
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<li class="member"><span class="function"><a href="phpinfo.html" class="function" rel="rdfs-seeAlso">phpinfo()</a> - 输出关于 PHP 配置的信息</span></li>
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<li class="member"><span class="function"><a href="dl.html" class="function" rel="rdfs-seeAlso">dl()</a> - 运行时载入一个 PHP 扩展</span></li>
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<li class="member"><span class="function"><a href="function_exists.html" class="function" rel="rdfs-seeAlso">function_exists()</a> - 如果给定的函数已经被定义就返回 TRUE</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> |