I am playing around with phppm and found memory leak in EntityType::class. This ticket on phppm repository explains the problem in details.

In short, EntityType caches results in local property so same query will not be executed more than once. Given that I do $em->clear() in kernel.terminate event (otherwise, identity map would quickly fill up), I get exception on next request when submitting the same form.

I am reporting this as bug and not a feature request because I saw other tickets about memory leaks being reported the same.

This might sound funny but what if a service is tagged with for example memory_clean, it would need to implement MemoryCleanInterface with only clean() method.

And on kernel.terminate event, this method would be called on all these services. It could be done with a simple listener but this would bring consistency for future bundles when local caching is needed.

What do you think?