Concentrating on the process of breaking and protecting Web applications written in PHP, this book also considers related Web programming topics such as client technologies (HTML, cookies, JavaScript), application protocols (HTTP, SMTP), SQL query language, and the breaking and protecting of the Apache Web server. Because these techniques can only be achieved by practical work, the book is divided into two parts: one covering the problem (puzzles) and one devoted to solving the problem. Evaluating the main problem for many Web programmers protecting their applications from being hacked-that they think differently than hackers-this book allows the reader to think like a hacker and understand the techniques they use. The accompanying CD-ROM contains distributions of PHP, Apache, and MySQL for Windows and Linux and the source codes for all of the solutions discussed.