Ye' old general discussion board. Basically, for everything that isn't covered elsewhere. Come here to shoot the breeze, shoot your mouth off, or whatever suits your fancy. This forum is not for asking programming related questions.
Start by learning some basic PHP. PHP: The Right Way is a great resource. Once you've got the basics down, find something that interests you and build it. If you're lacking inspiration, blogs, to-do lists, Twitter clones are all very easy beginner projects.
I gave a number of suggestions but I recommend finishing the CodeAcademy course first. You'll need at least the basics before you move on to trying to build something.