<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Find out whether an extension is loaded</title> </head> <body><div class="manualnavbar" 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.gc-collect-cycles.html">gc_collect_cycles</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, PHP 7)</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" id="refsect1-function.extension-loaded-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><strong>extension_loaded</strong></span> ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$name</code></span> )</div> <p class="para rdfs-comment"> Finds out whether the extension is loaded. </p> </div> <div class="refsect1 parameters" id="refsect1-function.extension-loaded-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <code class="parameter">name</code></dt> <dd> <p class="para"> The extension name. This parameter is case-insensitive. </p> <p class="para"> You can see the names of various extensions by using <span class="function"><a href="function.phpinfo.html" class="function">phpinfo()</a></span> or if you're using the <em>CGI</em> or <em>CLI</em> version of PHP you can use the <strong class="option unknown">-m</strong> switch to list all available extensions: <div class="example-contents screen"> <div class="cdata"><pre> $ php -m [PHP Modules] xml tokenizer standard sockets session posix pcre overload mysql mbstring ctype [Zend Modules] </pre></div> </div> </p> </dd> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.extension-loaded-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <strong><code>TRUE</code></strong> if the extension identified by <code class="parameter">name</code> is loaded, <strong><code>FALSE</code></strong> otherwise. </p> </div> <div class="refsect1 examples" id="refsect1-function.extension-loaded-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="example-527"> <p><strong>Example #1 <span class="function"><strong>extension_loaded()</strong></span> example</strong></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 seealso" id="refsect1-function.extension-loaded-seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><span class="function"><a href="function.get-loaded-extensions.html" class="function" rel="rdfs-seeAlso">get_loaded_extensions()</a> - Returns an array with the names of all modules compiled and loaded</span></li> <li class="member"><span class="function"><a href="function.get-extension-funcs.html" class="function" rel="rdfs-seeAlso">get_extension_funcs()</a> - Returns an array with the names of the functions of a module</span></li> <li class="member"><span class="function"><a href="function.phpinfo.html" class="function" rel="rdfs-seeAlso">phpinfo()</a> - Outputs information about PHP's configuration</span></li> <li class="member"><span class="function"><a href="function.dl.html" class="function" rel="rdfs-seeAlso">dl()</a> - Loads a PHP extension at runtime</span></li> <li class="member"><span class="function"><a href="function.function-exists.html" class="function" rel="rdfs-seeAlso">function_exists()</a> - Return TRUE if the given function has been defined</span></li> </ul> </p> </div> </div><hr /><div class="manualnavbar" 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.gc-collect-cycles.html">gc_collect_cycles</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>