As an owner of 4 other PHP books, I have no qualms in saying that this book is undoubtedly the best one of the bunch. Gilmore's book covers a vast assortment of topics important to every PHP programmer, and provides quite a few great examples. The great aspect of this book is that it serves as both a reference and a means for learning new PHP programming methodologies.If you're debating over which PHP book to buy, this is it.