php-doc-en/reference/session/functions/session-cache-expire.xml

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  <refentry id='function.session-cache-expire'>
   <refnamediv>
    <refname>session_cache_expire</refname>
    <refpurpose>Return current cache expire</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>int</type><methodname>session_cache_expire</methodname>
      <methodparam choice="opt"><type>int</type><parameter>new_cache_expire</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>session_cache_expire</function> returns the current setting of
     <literal>session.cache_expire</literal>. The value returned should be read
     in minutes, defaults to 180. If <parameter>new_cache_expire</parameter>
     is given, the current cache expire is replaced with
     <parameter>new_cache_expire</parameter>.
    </para>
    <para>
     The cache expire is reset to the default value of 180 stored in
     <literal>session.cache_limiter</literal> at request startup time. Thus,
     you need to call <function>session_cache_expire</function> for every
     request (and before <function>session_start</function> is called).
    </para>
    <example>
     <title><function>session_cache_expire</function> example</title>
     <programlisting role="php">
<![CDATA[
<?php

/* set the cache limiter to 'private' */

session_cache_limiter('private');
$cache_limiter = session_cache_limiter();

/* set the cache expire to 30 minutes */
session_cache_expire (30);
$cache_expire = session_cache_expire();

/* start the session */

session_start();

echo "The cache limiter is now set to $cache_limiter</ br>";
echo "The cached session pages expire after $cache_expire minutes";
?>
]]>
     </programlisting>
    </example>
    <note>
     <simpara>
      Setting <parameter>new_cache_expire</parameter> is of value only, if
      <literal>session.cache_limiter</literal> is set to a value
      <emphasis>different</emphasis> from <literal>nocache</literal>.
     </simpara>
    </note>
    <para>
     See also the configuration settings <link linkend="ini.session.cache-expire">
     session.cache_expire</link>, <link linkend="ini.session.cache-limiter">
     session.cache_limiter</link> and <function>session_cache_limiter</function>.
    </para>
   </refsect1>
  </refentry>

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