I actually picked this book up a while back so that I could get up to speed w/ PHP and MySQL programming and I really enjoyed it.  It was an easy read and I still refer back to it from time to time to find things, it stays on the bookshelf behind my desk. If you are looking for a quick way to get up to speed on PHP, I recommend this one for sure.  I also have a few other recommendations that I will be posting later on.

PHP 5 / MySQL Programming for the Absolute Beginner (For the Absolute Beginner) ISBN: 1592004946 ISBN-13: 9781592004942

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