What are some common pitfalls when handling GET requests in PHP?

One common pitfall when handling GET requests in PHP is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To mitigate this risk, always validate and sanitize input data before using it in your PHP code.

// Sanitize input data from GET request
$user_input = isset($_GET['user_input']) ? htmlspecialchars($_GET['user_input']) : '';