title: synchronize php session between apache server and nginx
body: <p>is it possible and how to pass php session variables i have with a php and apache.
  I have a main site with log in option for my users that runs from apache server and I want to use nginx as a chat/communication server that automatically gets all session variables i have in apache/php session without to pass php session id (for security reason). Both servers have a same ip and stais on a same domain. Nginx server will be on subdomain. Already have set php session to work on any sub domain but is this is valid also if I use nginx server.</p>
  
  <p>Any example will be helpful.
  Thanks in advanced.</p>