beforeAction的一个示例

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public function beforeAction($action)
{
    if(condition){
        Yii::$app->response->format = Response::FORMAT_JSON;
        Yii::$app->response->data = array(
            'status' => -1,
            'message' => '请先登录',
            'url' => \Yii::$app->getHomeUrl()
        );
        return false;
    }

    return true;
}