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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="sessionhandler.gc" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>SessionHandler::gc</refname>
<refpurpose>Cleanup old sessions</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis role="SessionHandler">
<modifier>public</modifier> <type class="union"><type>int</type><type>false</type></type><methodname>SessionHandler::gc</methodname>
<methodparam><type>int</type><parameter>max_lifetime</parameter></methodparam>
</methodsynopsis>
<para>
Cleans up expired sessions. Called randomly by PHP internally when a session starts or when
<function>session_start</function> is invoked. The frequency this is called is
based on the <link linkend="ini.session.gc-divisor">session.gc_divisor</link> and
<link linkend="ini.session.gc-probability">session.gc_probability</link> configuration
directives.
</para>
<para>
This method wraps the internal PHP save handler defined in the
<link linkend="ini.session.save-handler">session.save_handler</link> ini setting that was set
before this handler was set by <function>session_set_save_handler</function>.
</para>
<para>
If this class is extended by inheritance, calling the parent <parameter>gc</parameter> method will invoke the
wrapper for this method and therefore invoke the associated internal callback. This allows this method to be
overridden and or intercepted and filtered.
</para>
<para>
For more information on what this method is expected to do, please refer to the documentation at
<function>SessionHandlerInterface::gc</function>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>max_lifetime</parameter></term>
<listitem>
<para>
Sessions that have not updated for the last <parameter>max_lifetime</parameter> seconds will be removed.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the number of deleted sessions on success, &return.falseforfailure;.
Note this value is returned internally to PHP for processing.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>7.1.0</entry>
<entry>
Prior to this version, the function returned &true; on success.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
</refentry>
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