You don't seem to know anything about the "web people" you're criticizing here. PHP skills learned two decades ago are still very relevant today. It's the Java of the web world.
Modern PHP code looks nothing like PHP code back then. Of course, the core syntax is mostly the same, but if you look at a framework like D6 or D7 no one would do anything even remotely like this today. PHP security has completely changed since then as well.