1.使用 controller 中的 afterAction 方法，在響應完 action 之後，對資料格式化

use Yii;
class MobileController extends yii\rest\Controller
{
    public function afterAction($action, $result)
    {
        $rs = parent::afterAction($action, $result);
        // 也可以再定義 response
        // $response = Yii::$app->response;
        // $response->statusCode = 200;
        // $response->data = ['message' => 'hello world'];
        return ['data' => $rs, 'error' => '0'];
    }
}
 

public function init()
{
    parent::init();

    $handler = new \app\components\ApiErrorHandler;
    \Yii::$app->set('errorHandler', $handler);
    $handler->register();
}

public function init() {
        parent::init();
        Event::on(Response::className(), Response::EVENT_BEFORE_SEND, [$this, 'formatDataBeforeSend']);
    }

    public function formatDataBeforeSend($event){
        $response = $event->sender;
        //自已定義失敗的返回
        if ($response->data !== null && $response->isSuccessful==false) {
            $response->data = [
                'code'    => 500,
                'status'  => "FAIL" ,
                'message' => "系統繁忙,請稍後再試",
            ];
            $response->statusCode = 200;
        }
    }