> PHP is just as good as Ruby or Python.

I don't know if you're deliberately making a disgusting lie, a blatant troll or just lack knowledge. Either way, I wish to state, as someone who has several years of actual professional experience of all three, in very strong terms that this comment is nowhere near the truth.

But about the parent's question: I believe that no learning is ever wasted, so go ahead and learn PHP, but it might be a good idea to realize that it's quite unique in how badly designed it is, and that the rest of the programming world does many things differently.