Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent all around

This was the first book of 7 or so that I purchased and I think it's by far the best. The authors clearly explain various aspects of both PHP and MySQL. The book is one of those rare ones that does a great job for the beginners and winds up being a great reference for somewhat and mostly seasoned developers. I keep rereading various parts over and over and it's very helpful. If I was going to recommend just one book on the subject - this would definitely be it.