Robert Basic has written up a new post sharing a method he came up with for event handling in a Zend Expressive application. He makes use of Zend's own EventManager component to integrate it with some of his work from a previous post.

Three weeks ago I wrote a post on how to utilize Tactician in a Zend Expressive application. Today I want to expand on that post a little by adding the possibility to trigger and listen to events using the Zend EventManager component.

Using events allows our application to respond to different events that occur during a request.[...] This allows for a better separation of concerns in some cases, because if we take this approach, our code that deals with [the current functionality] doesn’t care any more what happens after that

He then gets into the code, showing how to install the EventManager component and how to create/inject an event manager into a current object (a Command). He then shows how to attach en event to the handler and perform an action when the event is hit. He points out one issue with this kind of setup, however: the need for all dependencies to be created prior to the event being attached. Fortunately the Zend EventManager comes with DI container support making it simpler to access dependencies needed during the firing of the event.