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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.8 $ -->
<!-- splitted from ./en/functions/session.xml, last change in rev 1.8 -->
<refentry id="function.session-unset">
<refnamediv>
<refname>session_unset</refname>
<refpurpose>
Free all session variables
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>void</type><methodname>session_unset</methodname>
<void/>
</methodsynopsis>
<para>
The <function>session_unset</function> function frees all session variables
currently registered.
</para>
<note>
<para>
If <varname>$_SESSION</varname> (or
<varname>$HTTP_SESSION_VARS</varname> for PHP 4.0.6 or less) is
used, use <function>unset</function> to unregister a session
variable, i.e. <literal>unset ($_SESSION['varname']);</literal>.
</para>
</note>
<para>
<caution>
<para>
Do NOT unset the whole <varname>$_SESSION</varname> with
<literal>unset($_SESSION)</literal> as this will disable the
registering of session variables through the
<varname>$_SESSION</varname> superglobal.
</para>
</caution>
</para>
</refsect1>
</refentry>
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-->
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