By using any part of the content you do so at your own risk - it is all offered with no warranty as to its suitability for any purpose, and may cause damage to your systems.
This book is copyright (c) 2003-2009 Paul Hudson. There may be trademarks and other copyrights in the content that are owned by others. You're welcome to take any PHP source code and use it in your own projects as if you wrote it yourself - feel free to use as much (or as little!) of it as you want.