Top critical review
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on March 10, 2011
If you need to write PHP extensions, you will need this book, simply because the information it contains is not available anywhere else. That being said, a lot of the content of this book feels like the kind of information that would normally be part of a free open source documentation.
The book assumes you are already somewhat familiar with PHP internals and basically "throws you in the deep end" right away. It is also aimed at C programmers (the language PHP is written in); if you only know PHP, you will probably have a hard time creating an extension using only the information contained in this book.
The book is also doesn't contain a lot of newer information, since it was written in 2006. Getting extensions to work with PHP 5.3 sometimes requires changes to old code that is not mentioned in this book.