Practical PHP Code Examples and Techniques to Prevent XSS and SQL Injection

Introduction to PHP and Security Challenges

PHP is a widely used server-side scripting language common in web development. However, web applications often face significant security threats such as XSS attacks and SQL injection, which developers must carefully address. This article covers both the theory and practical PHP coding techniques to effectively protect against these vulnerabilities.

What Are XSS and SQL Injection?

XSS (Cross-Site Scripting) attacks occur when attackers embed malicious scripts into web pages, causing browsers to execute code that can steal or manipulate user information. Common vectors include