laminas/laminas-eventmanager

Generic abstractions related to dispatching event

Provides tools that allow your application components to communicate with each other by dispatching events and listening to them

ReactPHP's core reactor event loop that libraries can use for evented I/O.

Event-driven, non-blocking I/O with PHP.

Revolt is a rock-solid event loop for concurrent PHP applications.

PHP Standard Library

The easiest way to get started with event sourcing in Laravel

Laravel is a web application framework with expressive, elegant syntax.

Ecotone shifts the focus to the business code. In order to make it happen, enables Message-Driven Architecture with DDD, CQRS, Event Sourcing in PHP.