What security measures can be implemented to prevent manipulation of GET variables in PHP?

To prevent manipulation of GET variables in PHP, you can validate and sanitize the input data before using it in your application. This can help prevent SQL injection, XSS attacks, and other security vulnerabilities. You can also use PHP functions like htmlspecialchars() or filter_var() to sanitize the input data. 

// Validate and sanitize GET variables
$id = isset($_GET['id']) ? filter_var($_GET['id'], FILTER_SANITIZE_NUMBER_INT) : null;

// Use the sanitized input in your application
if ($id !== null) {
    // Perform actions with the sanitized $id
} else {
    // Handle invalid input
}

Keywords

PHP security measures GET variables input validation data sanitization

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