Working basic example

[jordy-u]

Thanks for creating this library! Below I shared a quick example of how to use it.
Save the code below as a PHP file, put it on your webserver and run it.

Before running:<br>
1. Open a terminal and navigate to your webserver root directory.<br>
2. Download the library with: "composer require paragonie/anti-csrf".<br>
The package is now installed in the vendor/ folder.<br><br>
<?php
//Don't forget to call this:
session_start();

//Because of $_SERVER['DOCUMENT_ROOT'], you can place this PHP-file anywhere on the webserver.
require $_SERVER['DOCUMENT_ROOT'] . '/vendor/autoload.php';

use ParagonIE\ConstantTime\{
    Base64UrlSafe,
    Binary
};
use ParagonIE\AntiCSRF\AntiCSRF;
?>

<form method="POST">
    <?php
    //Generate CSRF token
    $server = $_SERVER;
    $csrft = new AntiCSRF( $server);
    $token_html = $csrft->insertToken('', true);
    ?>
    <input type="submit">
</form><br>

<?php
//Check CSRF token
$csrf = new \ParagonIE\AntiCSRF\AntiCSRF;
if (!empty($_POST)) {
    if ($csrf->validateRequest()) {
        echo 'Valid form';
    } else {
        // Log a CSRF attack attempt
        echo 'Token is invalid';
    }
}
?>

The reason I share this, is because it took me a while to understand how to use the library. So I hope this helped others.
Also, if you are reading this and didn't really use composer before, like me, This tutorial should help you out.