I need a little clearing up on Containers

1

I’m new to the Slim Framwork, am reading through the UserGuide, downloaded Slim Skeleton (as suggested in the tutorial), looked through the vendor folder and saw there container-interop and pimple (among other things).

So what I want to know is why they both are there. Pimple is a DI container and container-interop is “just” a container? Pimple does not require container-interop (according to it’s composer.json).
Is Slim itself using container-interop for something else internally?

If someone could clear this out for me, that would be nice.

2

container-interop provides an interface which Pimple, and many other DI packages, implement. This makes it easier if you start a project with one container, say Pimple, and then decide to switch and use a different container. Since your project depends on the implementation, rather than the specific container, you can swap with minimal fuss.

3

Alright, that makes sence. Thanks.