What are some potential pitfalls when manipulating $_GET variables in PHP scripts?

One potential pitfall when manipulating $_GET variables in PHP scripts is that it can leave your application vulnerable to security risks such as SQL injection attacks. To prevent this, always sanitize and validate user input before using it in your code. Use functions like filter_input() or htmlspecialchars() to clean and validate the data before processing it. 

// Sanitize and validate the $_GET variable before using it in your code
$user_id = filter_input(INPUT_GET, 'user_id', FILTER_SANITIZE_NUMBER_INT);

// Use the sanitized user_id in your code
if ($user_id) {
    // Process the user_id
} else {
    // Handle invalid input
}

Keywords

$_GET variables security vulnerabilities SQL injection cross-site scripting data validation

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