PHP Security Handbook

Introduction

The book «PHP Security Handbook» (author — Peter Lavin, 2016, 312 pages) is a practical guide to ensuring the security of web applications written in PHP. In an era when cyberattacks are becoming increasingly sophisticated and code vulnerabilities are the main cause of hacks, this book offers a systematic approach to protecting site data and functionality. Lavin does not simply list threats but teaches the developer to think like an attacker in order to prevent attacks in advance.

What the book is about

The publication covers all key aspects of PHP security: from basic principles of input data filtering to complex topics such as session protection, file handling, and database security. Each chapter is devoted to a specific type of vulnerability and contains code examples demonstrating both vulnerable and secure approaches. Special attention is paid to:

• SQL injections — explanation of the attack mechanism and protection methods using prepared statements (PDO).
• XSS (Cross-Site Scripting) — output filtering, context escaping.
• CSRF (Cross-Site Request Forgery) — using tokens and verifying the request source.
• Session security — protection against session hijacking and fixation.
• File management — preventing malicious file uploads and path traversal.
• Authentication and authorization — password storage (bcrypt, Argon2), rights management.

Who this book is for

The book is intended for intermediate and advanced PHP developers who are already familiar with the basics of the language but want to deepen their knowledge in the field of security. Beginners may find it challenging due to the abundance of technical details, but with basic experience, the material is well absorbed. The book will also be useful for technical leaders and architects responsible for project security.

What the reader will learn

• How to identify and eliminate the most common vulnerabilities in PHP applications.
• Proper methods for filtering and validating user input.
• How to work safely with databases, avoiding SQL injections.
• Principles of protection against XSS, CSRF, SSRF, and other attacks.
• How to organize secure password storage and session management.
• Methods for testing the security of your own code.
• How to use built-in PHP functions to enhance security (filter_var, htmlspecialchars, password_hash, etc.).

Strengths

The main advantage of the book is its practical focus. Each recommendation is supported by real code examples that can be immediately applied in a project. Lavin avoids excessive theory, focusing on what really works. The structure of the book is logical: from simple threats to complex ones, from isolated problems to comprehensive application security. Special mention should be made of the chapter on Secure Development Lifecycle, which teaches how to implement security checks at all stages of software creation.

Another plus is the emphasis on modern methods (at the time of the book's release). Although several years have passed, the basic principles remain relevant, and the author does not give outdated recommendations (for example, regarding the use of mysql_*). The book teaches the use of PDO, filters, password hashing — things that are still the standard.

Who it is recommended for

The book is a must-read for anyone who writes in PHP and wants their applications to be resistant to attacks. I especially recommend it to:

• Developers who are just starting to learn security and want to gain systematized knowledge.
• Teams that conduct code reviews and want to implement unified security standards.
• Freelancers creating custom websites — to protect clients from hacks.
• Students of web development courses who want to delve deeper into the topic.

Overall, «PHP Security Handbook» is not