How to set cookies for uuid
Not sure why you are asking for a script, or what the problem here is. To set a cookie, just use:
if (empty($_COOKIE["uuid"])) {
$uuid = uniqid(); // or use a real UUID
setcookie("uuid", $uuid, time()+30*24*60*60, "/");
}
else {
$uuid = $_COOKIE["uuid"];
}
Actually you should execute the setcookie once in a while and anyway to have the cookie lifetime refreshed.