public static function execute()
 {
     if (!isset($_GET['search'])) {
         $_GET['search'] = '';
     }
     if (!isset($_GET['cid'])) {
         $_GET['cid'] = 0;
     }
     if (!empty($_GET['search'])) {
         $result = Categories::find($_GET['search'], $_GET['cid']);
     } else {
         $result = Categories::getAll($_GET['cid']);
     }
     $result['rpcStatus'] = RPC::STATUS_SUCCESS;
     echo json_encode($result);
 }