True, but people associate it with web development. Do a university course, most likely they'll teach you PHP. Contract someone to do a small site for you, they'll probably use PHP. WordPress uses PHP and it's the foundation of some of the most popular websites on the web.
Even if you want it or not, PHP is part of the web, de facto or not.
Even if you want it or not, PHP is part of the web, de facto or not.