final public static function session_unset()
    {
        if ( !isset($_SESSION) ) return false;

        foreach ($_SESSION as $key => $value) {
            unset($_SESSION[$key]);
        }
    }
final public static function session_unset()
    {
        if ( !isset($_SESSION) ) return false;

        foreach ($_SESSION as $key => $value) {
            unset($_SESSION[$key]);
        }
    }
final public static function session_unset ( ) { if ( ! isset ( $ _SESSION ) ) return false ; foreach ( $ _SESSION as $ key => $ value ) { unset ( $ _SESSION [ $ key ] ) ; } }
Free all session variables

@link http://www.php.net/manual/en/function.session-unset.php
Free all session variables