What are some best practices to prevent users from using the browser's back button to resubmit values in PHP applications?

To prevent users from resubmitting values when using the browser's back button in PHP applications, one common approach is to use the Post/Redirect/Get (PRG) pattern. This involves redirecting the user to a different page after they submit a form, which prevents them from resubmitting the form data by using the back button.

// Check if form has been submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form data
    
    // Redirect user to a different page
    header("Location: success.php");
    exit();
}