symfony3Event Dispatcher

Syntax

$dispatcher->dispatch(string $eventName, Event $event);
$dispatcher->addListener(string $eventName, callable $listener, int $priority = 0);
$dispatcher->addSubscriber(EventSubscriberInterface $subscriber);

It is often best to use a single instance of EventDispatcher in your application that you inject into the objects that need to fire events.
It is best practice to have a single location where you manage the configuration of, and add event listeners to, your EventDispatcher. The Symfony framework uses the Dependency Injection Container.
These patterns will allow you to easily change your event listeners without needing to change the code of any module that is dispatching events.
The decoupling of event dispatch from event listener configuration is what makes the Symfony EventDispatcher so powerful
The EventDispatcher helps you satisfy the Open/Closed Principle.

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