title: unset session in smarty
body: <p>After I insert data to database I will set a session and then redirect page to another page,
  on another page I will show a message if session was set in smarty, everything is ok.</p>
  
  <pre><code>{if $smarty.session.insert===true}
        Thanks
  {/if}
  </code></pre>
  
  <p>Now how can I unset the session after I print my message ?</p>