Pro PHP Security is one of the first books devoted solely to PHP security. It will serve as your complete guide for taking defensive and proactive security measures within your PHP applications. The methods discussed are compatible with PHP versions 3, 4, and 5. The knowledge you'll gain from this comprehensive guide will help you prevent attackers from potentially disrupting site operation or destroying data. You'll learn about various security measures, for example, creating and deploying captchas, validating email, fending off SQL injection attacks, and preventing cross-site scripting attempts. Pro PHP Security guides developers through many of the defensive and proactive security measures that can be taken to help prevent attackers from potentially disrupting site operation or destroying data. Moreover, this book covers a wide range of security measures, showing readers how to create and deploy captchas, validate email, fend off SQL injection attacks, prevent cross-site scripting attempts, and more.