title: SESSION not working on server
body: <p>i have domain and i created a sub domain as well with the name <code>www.join.domainname.com</code>, now the problem is i start session on the main domain login page that is  <code>www.domainname.com/support/login.php</code></p>
  
  <p>all the pages in same domain working properly with session but when i am trying to check the session 
  on : <code>www.join.domainname.com/member.php</code></p>
  
  <p>i am not getting anything i don't know why?? Plz help me to solve the issue, here is the code of <code>www.join.domainname.com/member.php</code> :</p>
  
  <pre><code>session_start();
  $session_key = (isset($_SESSION['userid'])) ? $_SESSION['userid'] : 'empty';
  echo $session_key;
  </code></pre>
  
  <p>it return the result <code>empty</code>.</p>