why symfony http-foundation doesn't implement psr http-message ?? I want to use php frameworks interoperability.
in my opinion router , dispatcher , ioc container, http message and ... should have a psr interfaces and all frameworks should obey the interfaces.
so I want to simply implement my project not to use a specific php framework just use php packages which I need.
should I implement all that stuff myself ?? isn't it obvious that all frameworks should implement psr interfaces??
and after all why other psr standards (router, dispatcher, container)are taking too much time??
HttpFoundation and PSR-7 have a very very different basis (the biggest difference is the fact that PSR-7 objects are immutable, while HttpFoundation's objects are mutable). This makes it hard (if not impossible) for Symfony to update HttpFoundation to the PSR-7 interface without introducing a complete rewrite (and thus lots of backwards compatibility breaks for all current Symfony applications).
In order to still provide a way of supporting PSR-7, you can use the symfony/psr-http-message-bridge (docs), which provides factories to transform the HttpFoundation Request and Response into PSR-7 request and responses messages (and the other way around).
This is done automatically for you when you typehint against the PSR-7 interfaces in your controller instead of the HttpFoundation request.