sabre/event

An ultra-lightweight library for event-based development in PHP.

This library brings several popular event-based patterns from Javascript to the PHP world. They are simple, 0-dependency and written to be very legible.

The goal is to be as close as their Javascript equivalent as possible, in a way that's also sane for PHP. A second goal is to keep the patterns as simple as possible, so it's easy to reason about. The library is also used as a learning tool to understand complicated concepts (in particular the Promise and Event loop).

1. EventEmitter, which is a very lightweight "Publish and Subscribe" pattern,
2. Promises, which is a design pattern to improve chained asynchronous callbacks.
3. An event loop, aiding you in writing asynchronous PHP code.
4. Coroutines, to make Promise-heavy code even better.