php-doc-en/reference/session/functions/session-module-name.xml

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.session-module-name">
 <refnamediv>
  <refname>session_module_name</refname>
  <refpurpose>Get and/or set the current session module</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>session_module_name</methodname>
   <methodparam choice="opt"><type>string</type><parameter>module</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>session_module_name</function> gets the name of the current
   session module, which is also known as
   <link linkend="ini.session.save-handler">session.save_handler</link>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>module</parameter></term>
     <listitem>
      <para>
       If <parameter>module</parameter> is specified, that module will be
       used instead.
       Passing <literal>"user"</literal> to this parameter is forbidden. Instead
       <function>session_set_save_handler</function> has to be called to set a user
       defined session handler.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the name of the current session module.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>7.2.0</entry>
      <entry>
       It is now explicitly forbidden to set the module name to
       <literal>"user"</literal>. Formerly, this has been silently ignored.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

</refentry>

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