title: $_SESSION value always empty
body: <p>I conditionally embed one of two headers on a given page: either "Companies", or "Students and Professionals".</p>
  
  <p>I store the user's type ('', 'student', or 'professional') in the <code>$_SESSION</code> array on login, then use a simple if statement to determine which header to embed.</p>
  
  <p>The conditional (if) statement doesn't seem to work though; the first always evaluates as <code>TRUE</code> and <code>company_home_header.php</code> is always included, even when I've previously set <code>$_SESSION['usertype']</code> to <code>'student'</code> or <code>'professional'</code>.</p>
  
  <p>Why isn't the string stored in <code>$_SESSION['usertype']</code> being evaluating correctly? </p>
  
  <pre><code>&lt;?php
  
  if ($_SESSION['usertype'] == "")
  {
      include('includes/company_home_header.php'); 
  }
  elseif ($_SESSION['usertype'] == "student" OR 
          $_SESSION['usertype'] == "professional")
  {
      include('includes/home_header.php'); 
  }
  
  ?&gt;
  </code></pre>
  
  <p>Please help.</p>