public function start()
 {
     $controller = $this->controller;
     //controller
     $action = $this->action;
     //action
     if (!@(include_once 'controllers/' . strtolower($controller) . '.php')) {
         header("Location: " . BASE_URL . "error");
     }
     $run = new $controller();
     include_once 'model/model.php';
     $model = new Model();
     $readonly = $model->is_readonly_app($_GET["data_id"]);
     $_SESSION["readonly"] = $readonly;
     if (method_exists($run, $action)) {
         $run->{$action}();
     } else {
         header("Location: " . BASE_URL . "error");
     }
 }