function.extension-loaded.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Find out whether an extension is loaded</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.dl.html">dl</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.get-cfg-var.html">get_cfg_var</a></div> <div class="up"><a href="ref.info.html">PHP Options/Info Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.extension-loaded" class="refentry"> <div class="refnamediv"> <h1 class="refname">extension_loaded</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">extension_loaded</span> — <span class="dc-title">Find out whether an extension is loaded</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>extension_loaded</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$name</tt></span> )</div> <p class="para rdfs-comment"> Finds out whether the extension is loaded. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">name</tt></i></span> <dd> <p class="para"> The extension name. </p> <p class="para"> You can see the names of various extensions by using <a href="function.phpinfo.html" class="function">phpinfo()</a> or if you're using the <i>CGI</i> or <i>CLI</i> version of PHP you can use the <span class="option">-m</span> switch to list all available extensions: <div class="example-contents"><pre><div class="cdata"><pre>$ php -m[PHP Modules]xmltokenizerstandardsocketssessionposixpcreoverloadmysqlmbstringctype[Zend Modules]</pre></div> </pre></div> </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <b><tt>TRUE</tt></b> if the extension identified by <i><tt class="parameter">name</tt></i> is loaded, <b><tt>FALSE</tt></b> otherwise. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>extension_loaded()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><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></span></code></div> </div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: <b>extension_loaded()</b> uses the internal extension name to test whether a certain extension is available or not. Most internal extension names are written in lower case but there may be extension available which also use uppercase letters. Be warned that this function compares <em class="emphasis">case sensitive</em> ! <br /> </p></blockquote> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.get-loaded-extensions.html" class="function" rel="rdfs-seeAlso">get_loaded_extensions()</a></li> <li class="member"><a href="function.get-extension-funcs.html" class="function" rel="rdfs-seeAlso">get_extension_funcs()</a></li> <li class="member"><a href="function.phpinfo.html" class="function" rel="rdfs-seeAlso">phpinfo()</a></li> <li class="member"><a href="function.dl.html" class="function" rel="rdfs-seeAlso">dl()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.dl.html">dl</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.get-cfg-var.html">get_cfg_var</a></div> <div class="up"><a href="ref.info.html">PHP Options/Info Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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