php-doc-en/reference/session/functions/session-unset.xml

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.session-unset">
 <refnamediv>
  <refname>session_unset</refname>
  <refpurpose>Free all session variables</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>void</type><methodname>session_unset</methodname>
   <void/>
  </methodsynopsis>
  <para>
   The <function>session_unset</function> function frees all session variables
   currently registered.
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.void;
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <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 ($_SESSION['varname']);</literal>.
   </para>
  </note>
  <caution>
   <para>
    Do NOT unset the whole <varname>$_SESSION</varname> with
    <literal>unset($_SESSION)</literal> as this will disable the registering
    of session variables through the <varname>$_SESSION</varname> superglobal.
   </para>
  </caution>
 </refsect1>

</refentry>

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