PHP Cookies across multiple sub domains
Here’s how to make the browser store cookies across multiple sub domains.
The example I have used is for my site. The cookie given to
the browser will be used for any *.dtbaker.com.au address. The PHP code
creates a new session with a random session id, that session id is
stored in the cookie, and the cookie is sent to the browser. Next time
the browser sends a requests, it will send the cookie that contains the
session id.
Here’s the PHP code:
define("SESSION_NAME","S_DTBAKER");
if(!isset($_COOKIE[SESSION_NAME])){
// new session id
session_id( md5 ( uniqid ( microtime () ) ) );
session_name ( SESSION_NAME );
session_start();
// send cookie - change dtbaker.com.au to your domain name
setcookie( SESSION_NAME, session_id(), 0, '/', '.dtbaker.com.au');
}else{
session_id( $_COOKIE[SESSION_NAME] );
session_name( SESSION_NAME );
session_start();
}