title: CI_Sessions print specific user_data for all sessions
body: <p>Hey guys im quite new into programming and i would like some assistance...I store my sessions into a database table and each session row has a user_data array which contains the values email and logged_in.</p>
  
  <p>I want to search that table for every session entry and print only the email from the user_data array (to server as a "who's online") but i get very confused with the multiple arrays.</p>
  
  <pre><code>$email = $this-&gt;session-&gt;userdata('email'); //That's how i read the single session now
  </code></pre>