php-doc-en/reference/memcached/sessions.xml

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<chapter xml:id="memcached.sessions" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <title>Sessions support</title>
 <para>Memcached provides a custom session handler that can be used to store
  user sessions in memcache. A completely separate memcached instance is used
  for that internally, so you can use a different server pool if necessary. The
  session keys are stored under the prefix
  <literal>memc.sess.key.</literal>, so be aware of this if you use the
  same server pool for sessions and generic caching.</para>
 <para>
  <variablelist>

   <varlistentry xml:id="memcache.sessions.save-handler">
    <term>
     <parameter>session.save_handler</parameter>
     <type>string</type>
    </term>
    <listitem>
     <para>
      Set to <literal>memcached</literal> to enable sessions support.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry xml:id="memcache.sessions.save-path">
    <term>
     <parameter>session.save_path</parameter>
     <type>string</type>
    </term>
    <listitem>
     <para>
      Defines a comma separated of <literal>hostname:port</literal> entries to
      use for session server pool, for example
      <literal>"sess1:11211, sess2:11211"</literal>.
     </para>
    </listitem>
   </varlistentry>

  </variablelist>
 </para>
</chapter>

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