How To Create A Two-Factor Authentication (2FA) In PHP

Two-factor authentication (2FA) module in PHP using the RobThree/TwoFactorAuth library:

Step 1: Install Required Package Install the RobThree/TwoFactorAuth library, which provides the necessary functionality for 2FA in PHP. You can install it using Composer:

					composer require robthree/twofactorauth

Step 2: Implement the Two-Factor Authentication Logic Create a PHP file, for example, twofactor.php, and implement the logic for generating and verifying 2FA tokens using the RobThree/TwoFactorAuth library. Here’s an example:

					require 'vendor/autoload.php';

use RobThree\Auth\TwoFactorAuth;

$auth = new TwoFactorAuth('MyApp');

// Generate a secret key and QR code for the user to scan
function generateSecretKey()
    $auth = new TwoFactorAuth('MyApp');
    $secret = $auth->createSecret();
    $qrCodeUrl = $auth->getQRCodeImageAsDataUri('MyApp', $secret);

    return ['secret' => $secret, 'qrCodeUrl' => $qrCodeUrl];

// Verify the user's 2FA token
function verifyToken($secret, $token)
    $auth = new TwoFactorAuth('MyApp');
    $valid = $auth->verifyCode($secret, $token);

    if ($valid) {
        return ['success' => true, 'message' => 'Token is valid.'];
    } else {
        return ['success' => false, 'message' => 'Token is invalid.'];

// Example usage
$secretKey = generateSecretKey();

$verificationResult = verifyToken($secretKey['secret'], '123456');

In this example, we define two functions: generateSecretKey for generating a secret key and QR code, and verifyToken for verifying the user’s 2FA token. The TwoFactorAuth class from the RobThree/TwoFactorAuth library is used to perform the necessary operations.

Step 3: Test the Two-Factor Authentication You can now test the two-factor authentication functionality by executing the PHP file. The generateSecretKey function will return the generated secret key and QR code URL, which the user can scan with an authenticator app. The verifyToken function will verify the user’s token and return the verification result.

Please note that this is a basic example of a two-factor authentication module in PHP using the RobThree/TwoFactorAuth library. You can further customize and enhance the module based on your specific requirements, such as integrating with a database to store user secrets, implementing user registration and login flows, or integrating with a PHP framework like Laravel or Symfony.