Are there specific security measures that should be implemented to prevent form resubmission in PHP applications?

To prevent form resubmission in PHP applications, one common approach is to use the Post/Redirect/Get (PRG) pattern. This involves processing form submissions, redirecting to a new URL using HTTP 303 See Other status code, and then displaying the result. This prevents users from resubmitting the form data if they refresh the page. 

// Check if form has been submitted
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // Process form data

    // Redirect to a new URL to prevent form resubmission
    header('Location: success.php', true, 303);
    exit;
}

Keywords

CSRF protection token generation session management form validation HTTP POST requests

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