CI 3 RC Sessions: mark_as_temp()

Yes of course i know that, my data is like this:

Code:

$row = $query->row();
$data = array(
 'admin_id' => $row->admin_id,
 'username' => $row->username,
 'first_name' => $row->first_name,
 'last_name' => $row->last_name,
 'logged_in' => true
);