// Get the value of the "name" parameter from the query string $name = isset($_GET['name']) ? htmlspecialchars($_GET['name']) : ''; // Output the sanitized name echo "Hello, $name!";This example retrieves the value of the "name" parameter from the query string (e.g. "http://www.example.com/?name=John"), sanitizes it to prevent XSS attacks, and outputs a greeting using the sanitized name.