I am a PHP Programmer. So yes I could say that I only know about it. Actually I learn every kinds of programming language on college. But this is how we work, "if you want to be a programmer, just focus on what language you want to study, choose one the most you like". For this reason, I focus on my Web Programming. It's maybe the easiest programming language as ever I study in college. That's why I choose it :p
Well, moving on, this is a simple ways how to become a php programmer. A Beginner of course. Level where you can start over from bottom. Note that this is not my tips but I get it from Wikihow. Enjoy!