old/application/core/MY_Controller.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class MY_Controller extends CI_Controller
{

    public function __construct(...$names)
    {
        parent::__construct();
        $this->load->helper('cookie');
        $this->load->model('LoginModel', '', TRUE);

        $lang = isset($_SESSION['site_lang']) ? $_SESSION['site_lang'] : 'de';
        $_SESSION['site_lang'] = $lang;

        foreach($this->lang->is_loaded as $loadedName => $loadedLang) {
            if($loadedLang != $lang) {
                $this->lang->load($loadedName, 'de'); // Fallback
                $this->lang->load($loadedName, $lang);
            }
        }

        foreach ($names as $name) {
            $this->lang->load($name, 'de');
            $this->lang->load($name, $lang);
        }

        setlocale(LC_TIME, $lang);

        $rememberMe = get_cookie('rememberMe');

        if($rememberMe != NULL) {
            $this->LoginModel->autoLogin();
        }
    }

    public function hasPermission(...$permissions) {
        if(!isset($_SESSION['user']) || empty($_SESSION['user'])) {
            return false;
        }

        foreach ($permissions as $permission) {
            if(!in_array($permission, $_SESSION['user']['permissions'])) {
                return false;
            }
        }

        return true;
    }

    public function neededPermission($permission) {
        if(!$this->hasPermission($permission)) {
            redirect(base_url());
        }
    }
}