In a complex product (as in, most professional settings or large services/web sites) the PHP I've seen is grossly complex, and not intuitive—especially WordPress deployments.
Dev teams have to perform all kinds of gymnastics with the PHP code to get it to do what they want, and it's just a flat out nightmare that I've made sure my boss and colleagues know that I have no desire to work with it.
It always ends up a house of cards and full of vulnerabilities so that something is regularly getting exposed that allows at least editorial access. Security issues that should otherwise be no problem.
God knows how many other vulnerabilities exist. Every single server I've ever had has had bots and crawlers polling for common PHP files in an effort to exploit them, should they exist.
I just don't like having even the chance that my back-end source could, for want of a single character, spill out to a web page upon request.
And then there's performance...
Anyway for simple things, sure. For things that don't require much security, sure. For anything else... it's not for me.