This goes on to prove that PHP is still relevant today. No matter how many new frameworks come up, we all know PHP anyways.
Eh, it doesn't matter that I know PHP. I don't want to use it and have barely touched it in the last few years, despite understanding many of its quirks. I'm still using WordPress at the moment but if I have to write PHP I might just quit using it. Such a simple question as whether something is passed by reference or by value shouldn't result in "This is a super interesting piece of information! Looks like it's true;…
The price of a dedicated cpu is down to under $4 /month in common web hosts. Meanwhile the IO and other performance also improved so much that you dont ever, ever notice such things. So nobody cares about that kind of stuff. That's overoptimization that nobody asked for.