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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.8 $ -->
<!-- splitted from ./en/functions/info.xml, last change in rev 1.2 -->
<refentry id="function.extension-loaded">
<refnamediv>
<refname>extension_loaded</refname>
<refpurpose>Find out whether an extension is loaded</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>bool</type><methodname>extension_loaded</methodname>
<methodparam><type>string</type><parameter>name</parameter></methodparam>
</methodsynopsis>
<para>
Returns &true; if the extension identified by <parameter>name</parameter>
is loaded, &false; otherwise.
</para>
<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>
<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>
<note>
<para>
<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 extension
available which also use uppercase letters. Be warned that this
function compares <emphasis role="strong">case sensitive</emphasis> !
</para>
</note>
<para>
See also
<function>get_loaded_extensions</function>,
<function>get_extension_funcs</function>,
<function>phpinfo</function>, and
<function>dl</function>.
</para>
</refsect1>
</refentry>
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