title: CodeIgniter session_destroy() logout back
body: <p>How can I disable back when the user has pressed the logout button? This is my code</p>
  
  <pre><code>function logout(){
          session_start();
          session_unset();
          session_destroy();
          redirect(base_url(),'refresh');
      }
  </code></pre>
  
  <p>But everytime I click back, it gives me a "Confirm form resubmission" page and then when I reload it, the page before the logout function will be displayed</p>