CI_Session::sess_destroy PHP Метод

    public function sess_destroy()
    {
        session_destroy();
    }

 function sess_destroy()
 {
     //write your update here
     $this->CI->db->update('u_user', array('status_login' => 0), array('username' => 'admin'));
     //call the parent
     parent::sess_destroy();
 }