简单理解yii事件

• https://blog.csdn.net/qq43599939/article/details/80363827  通过观察者来理解yii事件
• 测试

  class TestController extends Controller
  {
      const EVENT_MY_EVENT = 'myEvent';
  
      public function actionTest()
      {
          echo 'this is  test action<br>';
          $myEvent = new MyEvent();
          $this->on(self::EVENT_MY_EVENT, ['app\modules\api\event\MyEvent', 'fooEvent']);  //绑定事件
          $this->trigger(self::EVENT_MY_EVENT, $myEvent);   //触发
      }
  }
  
  //事件类
  class MyEvent extends Event
  {
      public function fooEvent()
      {
          echo 'this is my first event instance.<br>';
      }
  }