public static function zero_rights()
 {
     $rights = array();
     $obj = new Privilege_Master();
     $arr = $obj->get_assoc_array();
     foreach ($arr as $key => $val) {
         if ($key != "privilege_id" && $key != "privilege_name") {
             $rights[$key] = "000";
         }
     }
     return $rights;
 }