Instruct: Classify the given Amazon review as either positive or negative.
Query: Not even helpful as a reference

The book is simply a listing of commands, organised by the same categories as the on-line manual, but missing an index and also missing the explanations and exmaples of the on-line manual. So unless you know in which category to find a command, you might spend ages to find its reference. Even if you do find the reference, the information is so brief that it is useless. If you've used the command a few times before, you'll know already (even if you have a lousy memory) the things described. If you haven't used it before, what you find is not enough to know how to use it. Rasmus, I thank you for inventing PHP, but I consider this book [not worth the money].