Cookies set on another server could not be retrieved using CURL - php

Question

I'm not sure if what I want to do is possible but here's the case.
Cookies are set on server A (first name, last name, etc).
I have a script on server A which gets the cookies, saves it into the db for future use and then finally displays it. Let's say the script is getCookies.php
Here's the code:
include 'dbconnect.php';
$sessid = $_GET['sid'];
$un = $_COOKIE['un'];
$ul = $_COOKIE['ul'];
$up = $_COOKIE['up'];
$ue = $_COOKIE['ue'];
$idn = $_COOKIE['idn'];
if(!empty($un) || !empty($ul) || !empty($up) || !empty($ue) || !empty($idn)){ // Save log to Database
$savedate = date('Y-m-d G:i');
$q = "INSERT INTO cookiedb (sid, un, ul, up, ue, idn, savedate) VALUES ('$sessid', '$un', '$ul', '$up', '$ue', '$idn', '$savedate')";
$rs = mysqli_query($con,$q);
}
echo "$un, $ul, $up, $ue, $idn";
The code above works if I directly access the script from the browser. However, if I access on another server (server B) using CURL, the cookies doesn't seem to work. It's not being read and saved in the db. I'm getting a blank response. I even used some codes like this suggestion I found here on stackoverflow:
$url = "http://serverA.co.za/getCookie.php";
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
// get headers too with this line
curl_setopt($ch, CURLOPT_HEADER, 1);
$result = curl_exec($ch);
// get cookie
// multi-cookie variant contributed by #Combuster in comments
preg_match_all('/^Set-Cookie:\s*([^;]*)/mi', $result, $matches);
$cookies = array();
foreach($matches[1] as $item) {
parse_str($item, $cookie);
$cookies = array_merge($cookies, $cookie);
}
var_dump($matches);
...but this code does not work. Do you have any idea how I can get the value for those cookies? If CURL could not be used here, are there any other ways? Thank you.