title: Subdomain overwiting CodeIgniter session
body: <p>I have 2 CodeIgniter installations, 1 on mydomain.com another on sub.mydomain.com.</p>
  
  <p>I am trying to get sub.mydomain.com to be able to access the CI session created by mydomain.com. I have edited the cookie section of both config files to:</p>
  
  <pre><code>$config['cookie_prefix']    = "";
  $config['cookie_domain']    = ".mydomain.com";
  $config['cookie_path']      = "/";
  $config['cookie_secure']    = FALSE;
  </code></pre>
  
  <p>Now if I go to mydomain.com setting the session and then go to sub.mydomain.com it seems to overwrite the session with a new one rather than being able to read from the existing session. </p>
  
  <p>Am I missing something here? </p>