<?

    function login()
    {
        $this->auth->logged_in() or redirect('admin');
        $redirect = $this->session->userdata('redirect_url') or true;
        $this->form
            ->validate($this->user_data->login_fields(), '#login_form')
            ->callback($this->auth, 'login')
            ->add_data($this->user_data->login_data())
            ->redirect($redirect)
            ->run();
        $this->template->load();
    }