title: session_start doesn't work :(
body: <p>I start a new session with : <code>session_start();</code>
  then I set some session variables like this : </p>
  
  <pre><code>$_SESSION['name']=$_POST['name'];
  </code></pre>
  
  <p>and some another variables.</p>
  
  <p>At bottom of page I set header to different page : </p>
  
  <pre><code>header('location: index.php');
  exit();
  </code></pre>
  
  <p>Now in new page (index.php) I can't access to my session variables, like <code>$_SESSION['name']</code>.</p>
  
  <p>What's wrong ? </p>
  
  <p>Thanks.</p>