Well, the most efficient way to detect your mistakes in PHP is with PHPUnit, an open source framework that automates unit testing by running the test as you go. Benefits of PHPUnit are significant: reduction in effort required to frequently test code flaw adds less overall confidence in your code improve relationships with my teammates open source The only problem with popular testing tool was the lack of documentation-until now, that is. For this, O'Reilly went right to the source, as Sebastian Bergmann, the author of PHPUnit Pocket Guide, also happens to be a PHPUnit's creator. This is a very valuable companion for anyone who is interested in testing the PHP code they write for web applications.