demo.php

<?php
header("Access-Control-Allow-Origin: " . $_SERVER["HTTP_ORIGIN"]);
header("Access-Control-Allow-Methods: POST, GET");
header("Access-Control-Max-Age: 1");
header("Access-Control-Allow-Credentials: true");

$cookie = (isset($_COOKIE["cookie"]) && $_COOKIE["cookie"] !== "") ? $_COOKIE["cookie"] : NULL;

if ( ! $cookie)
{
    $value  = "from cookie." . rand(1,10000);
    $expire = time() + 3600;
    $domain = ".josephj.com";
    header("Set-Cookie: cookie=$value; expires=$expire; domain=$domain");
}
echo "cookie={$cookie}";
?>