What are the potential risks or consequences of not implementing form resend protection in PHP applications?

Without implementing form resend protection in PHP applications, users may accidentally submit the same form multiple times, causing duplicate entries in the database or unintended actions to be taken. This can lead to data inconsistencies and potential security vulnerabilities. To prevent this, developers can implement form resend protection by generating a unique token for each form submission and validating it before processing the request. 

session_start();

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (!isset($_POST['token']) || $_POST['token'] !== $_SESSION['token']) {
        // Invalid token, handle error or redirect
    } else {
        // Process form submission
        // Generate new token
        $_SESSION['token'] = bin2hex(random_bytes(32));
    }
}

// Generate token for the form
$_SESSION['token'] = bin2hex(random_bytes(32));

Keywords

security CSRF form validation session management data integrity

Related Questions