What is the correct way to do events in Yii2?

Question

Yii

Good afternoon,
I want to make sending mail after registration an event.
I'll make an event.

namespace app\event;

use yii\base\Component;
use yii\base\Event;

class MessageEvent extends Event
{
    public $message;
    
    public function send($message)
    {
        return \Yii::$app->get('mailer')->compose(['html' => 'actiovationAuthKey-text'], ['user' => ['first_name' => 'asdfasdfsa'])
                        ->setFrom([\Yii::$app->params['supportEmail'] => \Yii::$app->name . ' robot'])
                        ->setTo('[email protected]')
                        ->setSubject('$message)
                        ->send();
    }
   
}

and after validating and saving the user, I make a call and a trigger.

$event = new app\event\MessageEvent;
                $event->message = 'sadf';
                $this->trigger(self::EVENT_MESSAGE_SENT, $event);

Tell me what am I doing wrong? there are no errors and the message did not come) so I'm guessing, thanks for the help. I'm sorry, first experience with events.

Answer 1

In your case, there is no part that is subscribed to the event. You excite him, but no one listens to him.
Here is your example, via global events only:

class MessageSendEvent extends Event
{
    const EVENT_MESSAGE_SEND = 'message-send-event';

    /**
     * @var string
     */
    public $message;

    /**
     * ...
     */
    public function send ()
    {
        echo $this->message;
    }
}

Now we subscribe and "listen" to the event:

# Вешаем обработчик события
Yii::$app->on( MessageSendEvent::EVENT_MESSAGE_SEND, function ( MessageSendEvent $event ) {
    $event->send();
} );

And at the right moment we excite it:

# Инициируем событие
Yii::$app->trigger(
    MessageSendEvent::EVENT_MESSAGE_SEND,
    new MessageSendEvent( [
        'message' => 'Сообщение!'
    ] )
);

But damn, you have such an overhead here that it makes no sense to use such an example. It's easier to call ->send() yourself and that's it, without any events there.
UPD: The Event object, it is essentially a data carrier. He does NOT have to do the work himself. It only has to deliver the necessary data to the worker, and the worker contains all the logic.