I tried to implement TOTP PHP library as another authentication for my login form. I downloaded and followed installation instruction from github as folowing code:
<?php
include('src/Factory.php');
include('src/HOTP.php');
include('src/HOTPInterface.php');
include('src/OTP.php');
include('src/OTPInterface.php');
include('src/ParameterTrait.php');
include('src/TOTP.php');
include('src/TOTPInterface.php');
use OTPHP\TOTP;
$otp = TOTP::create();
echo 'The current OTP is: '.$otp->now();
?>
Yet, I ended up with error message Warning: Unsupported declare 'strict_types' in C:\wamp64\www\otp\src\HOTP.php on line 3 and Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in C:\wamp64\www\otp\src\HOTP.php on line 28.
I could not figure out why it was that.
Install lower version of package like ~8.0, which works with PHP 5.5
https://github.com/Spomky-Labs/otphp/blob/v8.3.2/composer.json#L19
add this in your composer.json
"require": {
"spomky-labs/otphp": "~8.3"
}
Or use this link to download it as ZIP and add it to your project manually
https://github.com/Spomky-Labs/otphp/archive/v8.3.2.zip
Better is to use composer, because you have auto autoloader. :) That way there is no need to manually require files.