We only use PHP for back end at work mainly to support legacy code base. Only 2 projects use PHP 7 and all others php 5.2 or 5.4.
Our main project's user codebase is of 30K+ users (e-learning). So PHP can deal with big projects despite being a very weak language (I hate its structure, the functions, the API that stop workings etc... sorry for the rant).
New websites (when simple enough) are done with WordPress. A few more complexe ones are done with CakePhp.
All the rest is done by hand.