FHC-Core/application/controllers/dashboard/DashboardAdmin.php

<?php

if (! defined('BASEPATH')) exit('No direct script access allowed');

/**
 */
class DashboardAdmin extends Auth_Controller
{
    private $_uid;  // uid of the logged user

    /**
     * Constructor
     */
    public function __construct()
    {
        // Set required permissions
        parent::__construct(
            array(
                'index' => 'dashboard/admin:rw',
				'preview' => 'dashboard/admin:r',
            )
        );

        $this->load->library('AuthLib');
        $this->load->library('WidgetLib');

        $this->_setAuthUID(); // sets property uid

        $this->setControllerId(); // sets the controller id
    }

    // -----------------------------------------------------------------------------------------------------------------
    // Public methods
	public function index()
	{
        $this->load->view('dashboard/dashboard_admin.php', []);
	}

	public function preview()
	{
		$dashboard_kurzbz = $this->input->get('db') ?? 'CIS';
		$this->load->view('dashboard/dashboard_preview.php', ['dashboard_kurzbz' => $dashboard_kurzbz]);
	}

    // -----------------------------------------------------------------------------------------------------------------
    // Private methods

    /**
     * Retrieve the UID of the logged user and checks if it is valid
     */
    private function _setAuthUID()
    {
        $this->_uid = getAuthUID();

        if (!$this->_uid) show_error('User authentification failed');
    }
}