[PHP] Why cookie is created?

[Jerry Swanson]

I don't use cookie for my page. I use session. As I understand cookies
don't create any files on user  computer. I have this code below on my
page.
When I access this page immediately cookie is created on my computer.
Any ideas why?


<?php
session_start();
$referral = $_SESSION['referral'];
if(empty($referral)) {
        $referral = $_SERVER['QUERY_STRING'];
        $_SESSION['referral'] = $referral;
}

?>

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