I got this book as soon as it was published but wish I'd had it a year ago. I've been writing exacly the sort of smaller ecommerce sites described here and having the latest security and coding techniques explained step by step is great. This is not a book for the php/SQL beginner but for someone moving into an new area of programming or looking to update their skills. The tips in the margins scattered liberally throughout the book are great. I've learnt loads just skimming this book.
One thing about computer books is that many of them refer to other pages (often ones you've not got to yet) which is very frustrating, I've not come across that yet here. On top of that, most of the diagrams are in the same page that they are written about - wonderful!