[jjice]

If you work in a legacy PHP codebase, it's inevitable that you'll see $_GET in the middle of what you thought could be isolated business logic. The coupling that was done in my experience old PHP codebases is awful.

I guess I can't blame PHP because it comes down to the devs to enforce decent boundaries, but I think PHP makes it easier than others to do so.

PHP is so much better now, but if you're writing PHP, there's a very good chance you're not working with that new, clean PHP.