You might think that I would know the driver API by heart at this point, but alas, my many trips back to the documentation are proof that my brain is like a fixed length queue – if something new goes in, something else must go out. So, I've created a cheat sheet that saves me some of those trips to the documentation. I’m hoping that others might find it helpful too
He mentions a few things that make the sheet particularly useful - signatures for the functions are included but not the type info for the parameters, a list of PHPTYPE constants, FETCH constants (for the return type) and CURSOR constants (for defining cursor return type). You can see a preview of it here (as a PNG) and grab the actual sheet here as a PDF.