access session data using PHPSESSID value

Question

I am implementing web-socket server in php for my project. When a user will create websocket connection, it will send PHPSESSID cookie in request headers to the webserver page. I want to fetch session data for every user using their PHPSESSID cookie value. This server page can not fetch session value by simply using $_SESSION['name']

For every incoming socket connection, i fetch PHPSESSID

$cookie = handshake($header, $socket_new, $host, $port);

here handshake function will return PHPSESSID cookie.

session_id($cookie);
session_start();
$username = $_SESSION['name'];

For every websocket connection i am receiving right cookie but $username only for first connection. This php file is running in background and i have to authenticate users with their cookie but it seems that session_id($cookie); is setting only once. Is there any way to fetch session data for different PHPSESSID values on this single page.

Answer 1

As @grossvogel mention just using session_write_close() function just before session_id() function enable me to fetch values for different sessions using PHPSESSID cookie. Now i can use different sessions within single page