How to verify if a user is logged in?

Since you set both 'username' and 'loginuser' in your session, you can use both or either of them to check if the user is logged in.

Here is a quick example using 'username' for the check

PHP Code:

// Check if username exists in session
if ($this->session->userdata('username') === NULL)
{
    // User is not logged in, redirect to login screen
}
else
{
    // User is logged in, allow access
}