PHP Application Security: Refactoring and Validation

Insecure code can compromise user data and ruin your application's reputation, yet many developers struggle with implementing robust security measures. This text-based course teaches you how to systematically refactor your PHP applications to defend against common web vulnerabilities. You will learn to identify security gaps, clean up legacy code, and establish strong validation rules to protect your systems.\n\nWhat you'll learn:\n- Understand foundational web security concepts and the importance of secure coding principles.\n- Prevent Cross-Site Scripting (XSS) by properly escaping output with modern PHP techniques.\n- Implement strict input validation and sanitization using built-in PHP filters.\n- Protect your database with prepared statements and prevent duplicate entries using robust constraints.\n- Refactor insecure legacy code into clean, maintainable, and secure structures.\n- Apply modern PHP security practices, including secure password hashing and session handling.\n\nThis course starts with essential security terminology and foundational concepts before guiding you through practical, text-based refactoring scenarios. It is designed for beginner to intermediate PHP developers who want to write safer code without needing prior security experience. Start reading today to elevate your PHP development skills and protect your users.