Reference

Dispatching PSR-7 Middleware

PSR-7 defines interfaces for HTTP messages, and is now being adopted by many frameworks; Laminas itself offers a parallel microframework targeting PSR-7 with Mezzio. What if you want to dispatch PSR-7 middleware from laminas-mvc?

laminas-mvc currently uses laminas-http for its HTTP transport layer, and the objects it defines are not compatible with PSR-7, meaning the basic MVC layer does not and cannot make use of PSR-7 currently.

The package laminas-mvc-middleware is a laminas-mvc application module that enables dispatching of middleware, middleware pipes, and request handlers for route matches that contain a middleware parameter.

Built-in Optional Support Deprecation

With version 2.7.0, laminas-mvc began offering the now deprecated Laminas\Mvc\MiddlewareListener. The MiddlewareListener is always enabled, but requires optional dependencies installed to be used.
A new laminas-mvc module, laminas-mvc-middleware, transparently replaces it with Laminas\Mvc\Middleware\MiddlewareListener when registered with a laminas-mvc application.

Starting with version 3.2.0, the built-in Laminas\Mvc\MiddlewareListener will trigger deprecation level errors on any attempt to handle a route match containing a middleware parameter.

If your application currently depends on the built-in optional middleware support, laminas/laminas-mvc-middleware:~1.0.0 provides a drop-in replacement. If you use this new module, please note that the module Laminas\Mvc\Middleware must be enabled in your laminas-mvc application.