"PHP is rarely considered "old school." It's considered bad"
PHP hasn't been considered 'bad' for a few years now. It has been battle tested on many large-scale websites.
Now, One of the main issues is that anyone can write a few lines of code and call themselves a developer, so you have horrible code bases still out there...but this has more to do with the developer than the language.
"my answers to which are "not enough" and "not even if you paid me", respectively
I love hearing answers like this. This is why I'm still paid so well to write PHP code after 15 years in the industry.