请问你在哪个地方打印$_GET的，$_GET真正被处理的时候在这里，假设是基于?r=这样子的

public function resolve()
{
        $result = Yii::$app->getUrlManager()->parseRequest($this);
        if ($result !== false) {
            list ($route, $params) = $result;
            if ($this->_queryParams === null) {
                // 罪恶的代码
                $_GET = $params + $_GET; // preserve numeric keys
            } else {
                $this->_queryParams = $params + $this->_queryParams;
            }
            return [$route, $this->getQueryParams()];
        } else {
            throw new NotFoundHttpException(Yii::t('yii', 'Page not found.'));
        }
}

    public function actionIndex()
    {
        print_r($_GET['xp']);
        return $this->render('index');
    }

在 console/config/main.php 中添加如下代码：

'components' => [
    'authManager' => [
        'class' => 'yii\rbac\DbManager',
    ],
],

关闭终端，重新打开终端执行 php yii migrate --migrationPath=@yii/rbac/migrations