Please correct title - it's how to prepare for a PHP technical interview.
LOL!
Facebook and Wayfair are using it among https://trio.dev/blog/companies-using-php
Perl has fallen. Fortran is legacy. Ruby isn't as hot as it once was.
At some point, new people won't want to learn an old language. This is when a language begins to wither away.
It will happen to PHP. Eventually (in the technological limit) it'll happen to everything.
The parent doesn't make any reference to PHP programmers, and doesn't appear to be looking down on any person or class of people, so this doesn't seem to be the embarrassing brand of elitism.
There are precious few good reasons to use PHP in 2021, a world of much better languages with much stronger ecosystems than the world of two decades ago when PHP was a reasonable choice.
C has more problems than PHP, yet as with PHP, it is dominant worldwide.
Just the linux kernel alone, its scope, forks, usage makes C god.
There are always a lot of "but!" statements to this reality, but they don't change fact.
PHP, modern PHP is a different beast than a decade, 20 years ago. Imagine if C took on some of the properties of rust, but was still just called C. And used as C.
That's PHP, you bunch of hosers!