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PHP Using Cookies and JWTs for Secure Authentication Cookies Working with Cookies

I am stuck on this challenge

After rewatching the video many times, i dont know how to proceed. I am using the redirect function but somehow the system said i am using the undefine method.

Thank you very much and waiting for your reply.

cookies.php
<?php
require __DIR__ .'/vendor/autoload.php';

// create cookie
redirect('/',1);
redirect.php
<?php

function redirect($path, \Symfony\Component\HttpFoundation\Cookie $cookie = null)
{
    $response = \Symfony\Component\HttpFoundation\Response::create(
        null, 
        \Symfony\Component\HttpFoundation\Response::HTTP_FOUND, 
        ['Location' => $path]
    );
    $response->send();
}