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symfony/event-dispatcher v7.0.0-RC1

Provides tools that allow your application components to communicate with each other by dispatching events and listening to them
Package summary
Package created
16 Oct 2011
Version published
27 Jul 2023
Total deps
Direct deps
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Frequently Asked Questions

What does symfony/event-dispatcher do?

The Symfony/Event-Dispatcher is a useful tool that facilitates communication among application components through event dispatching and listening protocols. The package enables components to emit events, which can then be picked up and handled by designated listeners, effectuating efficient intra-application communication. This tool is part of the larger Symfony PHP framework, but it can be utilized independently, offering a seamless way to build a dedicated communication system in your PHP application.

How do you use symfony/event-dispatcher?

Usage of the Symfony/Event-Dispatcher requires a certain amount of basic setup. Here's a simplified example of how it can be used:

use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\EventDispatcher\Event;

$dispatcher = new EventDispatcher();

$dispatcher->addListener('event.name', function (Event $event) {
    // your code here, which will be executed when the event is dispatched

// ... later in your application
$event = new Event();
$dispatcher->dispatch('event.name', $event);

In this code snippet, an event listener is registered to handle a specific type of event ('event.name'). You can place any code within the listener function that you want to be executed when the event is dispatched. Later in your application, you may need to dispatch the event. This is done using the dispatch method of the EventDispatcher object, passing in the event name and an instance of the Event.

Where are the symfony/event-dispatcher docs?

The comprehensive documentation for Symfony/Event-Dispatcher can be found on the Symfony website, available at https://symfony.com/doc/current/components/event_dispatcher.html. The documentation offers in-depth information on how to effectively use the component in various contexts. Users can also contribute to improving the package by referring to the 'Contributing' section. Issues and pull requests can be dealt with in the main Symfony repository, ensuring constant development and improvement of the package.