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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xml:id="function.extension-loaded" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>extension_loaded</refname>
<refpurpose>Find out whether an extension is loaded</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>extension_loaded</methodname>
<methodparam><type>string</type><parameter>name</parameter></methodparam>
</methodsynopsis>
<para>
Finds out whether the extension is loaded.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>name</parameter></term>
<listitem>
<para>
The extension name.
</para>
<para>
You can see the names of various extensions by using
<function>phpinfo</function> or if you're using the
<literal>CGI</literal> or <literal>CLI</literal> version of
PHP you can use the <option>-m</option> switch to
list all available extensions:
<screen>
<![CDATA[
$ php -m
[PHP Modules]
xml
tokenizer
standard
sockets
session
posix
pcre
overload
mysql
mbstring
ctype
[Zend Modules]
]]>
</screen>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns &true; if the extension identified by <parameter>name</parameter>
is loaded, &false; otherwise.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>extension_loaded</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
if (!extension_loaded('gd')) {
if (!dl('gd.so')) {
exit;
}
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>5.0.0</entry>
<entry>
<function>extension_loaded</function> 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 extensions
available which also use uppercase letters. Prior to PHP 5, this function
compared the names case sensitively.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>get_loaded_extensions</function></member>
<member><function>get_extension_funcs</function></member>
<member><function>phpinfo</function></member>
<member><function>dl</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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