Flash and PHP Bible
Matthew Keefe
Wiley
I bought this book essentially to learn Actionscript 3. I had used AS2 before and was quite adapted to it, but with PHP and MySQL my experience was zero. By reading this book and really taking time to go through the examples taught in it, I can say that I now feel comfortable with both AS3 and PHP + MySQL. I think the most important thing is to not just read and understand, but to actually try the things by yourself. Modify, try things... trial and error, guys. That's how we learn, and this book gave me a really good base understanding to start from.