There's a zeroth step missing from both the Quickstart and Full Set Up: install php-fpm, configure it, and configure your http server to serve using it as a backend.
It seems to be taken for granted — that's something you'd already have in place if you're already serving applications in PHP, but would have to figure out on your own if you haven't served anything in PHP so far in your life.
It seems to be taken for granted — that's something you'd already have in place if you're already serving applications in PHP, but would have to figure out on your own if you haven't served anything in PHP so far in your life.