If you're depending on very weird edge cases in PHP I'd consider that buggy even if it works.
Re:What's new in PHP 8?
by john-shaffer on Friday August 14, 2020 @02:13PM
(#24161290)
This is a completely useless discussion if you're going to assume that code depends on "very weird edge cases" with no idea of what the code actually does.
I can't think of a single time that I've seen a bug exposed by language changes. I have seen dozens of bugs created by language changes, however. (Mostly crashes).