So it will work for really old(-style) php then. I still see new software coming out (and being sold) written in that style: no frameworks, classes or exceptions. Not relevant for this implementation, but many (popular) commercial wp plugins are still written like that; installed one for a client a few days ago and it was a dense mix of code and html without classes, exceptions or namespaces. And that is a popular, new, commercial one.

That's pretty common within the WordPress community, yeah, and it doesn't have to be ugly if the coders knew what they were doing. A lot of it is a mess, though.

Also commercial standalone scripts as I see; I think many are 15+ years old originally and are just updated with better fronts and some new features but all the logic is just the same hacking.