A very quick and insight provider for novice php developers. Covers almost every possible threat. Though, many topics are so brief that it gets really hard to understand, & implement but over all, it is a nice reading experience.

Essential PHP Security is essential for all php developers who were worried about the security of their code.These topics helps to to get rid of every security issues you were facing in real time.Worth Buying...

Although this book is published some time back, it is still very good source of knowledge about PHP web application security.

For latest advanced level security study, use owasp.org but for beginners, this book is best as it describe each and every topic with problem and solution specifically in PHP.

This is a small book that goes straight to the topic without wasting time. Clear and concise. This is a good starting book on PHP security and is intended towards beginners. It is a handy reference book.