➜  emitter git:(master) ✗ php vendor/bin/phpunit tests/EmitterTest.php
PHPUnit 7.5.20 by Sebastian Bergmann and contributors.

..........                                                        10 / 10 (100%)

Time: 24 ms, Memory: 4.00 MB

OK (10 tests, 10 assertions)

API

Emitter#on(event, fn)

Register an event handler fn.

Emitter#once(event, fn)

Register a single-shot event handler fn, removed immediately after it is invoked the first time.

Emitter#off(event, fn)

Pass event and fn to remove a listener.
Pass event to remove all listeners on that event.
Pass nothing to remove all listeners on all events.

Emitter#emit(event, ...)

Emit an event with variable option args.

Emitter#listeners(event)

Return an array of callbacks, or an empty array.

Emitter#hasListeners(event)

Check if this emitter has event handlers.

License

MIT