Alongside the loop and timers, this package includes a small in-memory event system.

There are only two classes involved:

• Event, which carries an event name and optional detail data
• EventDispatcher, which stores subscribers by event name and publishes events to them

¶Subscribing to an event

use GT\Async\Event\Event;
use GT\Async\Event\EventDispatcher;

$dispatcher = new EventDispatcher();

$dispatcher->subscribe("tick", function(Event $event) {
	echo "Received: ", $event->getName(), PHP_EOL;
});

¶Publishing an event

$dispatcher->publish(new Event("tick"));

That will invoke every callback subscribed to "tick", in the same order they were added.

¶Passing detail data

The Event object can carry any detail value:

$dispatcher->subscribe("message", function(Event $event) {
	echo $event->getDetail(), PHP_EOL;
});

$dispatcher->publish(new Event("message", "Hello"));

¶What this dispatcher does not do

This is a deliberately small utility. It does not include:

• wildcard subscriptions
• unsubscribe methods
• cross-process or network delivery

If you need those features, they would need to be built on top.

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Finally, take a look at Examples for the bundled scripts in this repository.