This may be the most superficial programming book I've ever encountered. On one hand, the author does make sure readers can't possibly be intimidated by PHP. On the other, basics like functions and arrays are considered beyond the scope of the book and relegated to an appendix! At one point, classes come up unavoidably but are waved away with a "this will work--just trust me and don't worry about it." Meanwhile, there are four or five entire chapters on MySQL--apparently that's not outside the scope. Makes no sense to me.
I got this as a free review copy back when I used to teach, and it's a perfect example of why I never picked books published by Thomson/Course Technology. They're always super babyish and lacking in substance.
There is a quick reference in Appendix B that looks like it would be pretty handy, though, so yay for that. I often make myself a 2-page cheat sheet when picking up a new language--the quick reference will speed that up a good bit.