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<?php
//----------------------- handles ---------------------------------
// OLog   app\models\OLog.php
class OLog {
    static public function add($event){
        echo "我记录了一条登陆记录";
    }
}

// Admin app\models\Admin.php
class Admin {
    static public function sendMail($event){
        echo "我给管理员发了邮件";
    }
}

// User app\models\User.php
class User {
    static public function notifyFirend($event){
        $userId = $event->userId;
        echo "告诉了朋友们我登陆了";
    }
}

//------------ definde event that extends Event --------------------
// event/UserLoginEvent.php
use yii\base\Event;
class UserLoginEvent extends Event {
    public $userId = 0;
}

//-------------events binding handles and use ------------------
use app\events\UserLoginEvent;
class UserController extends Controller {
    //	定义事件名字
    const EVENT_USER_LOGIN = 'user_login';
    public function __construct(){
        //	绑定事件
        $this->on(self::EVENT_USER_LOGIN,['app\models\OLog','add']);
        $this->on(self::EVENT_USER_LOGIN,['app\models\Admin','sendMail']);
        $this->on(self::EVENT_USER_LOGIN,['app\models\User','notifyFirend']);
    }

    public function actionIndex(){
        // 这里有一些代码.....
        Yii::$app->user->login($user);
        
        // 使用，并且传参为$event，可以把相关参数传递给调用者
        $event = new UserLoginEvent();
        $event->userId = $user->id;

        $this->trigger(self::EVENT_USER_LOGIN,$event);
    }
}