Nate if you can do PHP, there is nothing CSS can throw at you that will not bounce happily on your nose.
If you just want a cheat sheet, or to make a basic style sheet, google "online css generator"
I'm saying google not to be impolite, but because there are so many of them, I don't know which one you might like the best, and neither will you, till you click them!
If there is a particular thing you want to do, maybe tell the thing? And people can tell you if it's something that CSS can do, or if you'll need javascript or some arcane confusing other thing that I don't understand at all, but you will understand just fine, because you have climbed the fearsome mountain that is PHP.