Request::instance PHP Method

        public static function instance()
        {
            return \Illuminate\Http\Request::instance();
        }

 public function action_edit($role_id = 0)
 {
     $role_id = intval($role_id);
     if ($role_id <= 0) {
         Request::instance()->redirect('/admin/role/index');
     }
     $role = BLL_Role::getById($role_id);
     if (!$role) {
         Request::instance()->redirect('/admin/role/index');
     }
     $data = array();
     if (Request::$method == "POST") {
         if (intval($_POST['role_id']) != $role_id) {
             Request::instance()->redirect('/admin/role/index');
         }
         $post = $role->validate_update($_POST);
         if ($post->check()) {
             $post_values = $post->as_array();
             $role->name = $post_values['name'];
             $role->description = $post_values['description'];
             $role->save();
             Request::instance()->redirect('/admin/role/index');
         } else {
             $_POST = $post->as_array();
             $data['errors'] = $post->errors('admin/role/form');
         }
     }
     $this->template->title = __("Sửa nhóm tài khoản");
     $this->template->section_title = __("Sửa nhóm tài khoản");
     $data['role'] = $role;
     $this->template->content = View::factory('admin/role/edit', $data);
 }