   #PHP Manual Session handling functions session_unregister
   session_write_close

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                                 session_unset

   (PHP 4 )
   session_unset --  Free all session variables

Description

   void session_unset ( void )

   The session_unset() function frees all session variables currently
   registered.

     Note: If $_SESSION (or $HTTP_SESSION_VARS for PHP 4.0.6 or less) is
     used, use unset() to unregister a session variable, i.e. unset
     ($_SESSION['varname']);.

   Caution

   Do NOT unset the whole $_SESSION with unset($_SESSION) as this will
   disable the registering of session variables through the $_SESSION
   superglobal.
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