old/application/controllers/Redirect.php

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

    class Redirect extends MY_Controller
    {

        public function __construct()
        {
            parent::__construct();
            $this->load->model('RedirectModel', '', TRUE);
        }

        public function index($redirect = null)
        {
            if ($redirect == null) {
                redirect(base_url());
            } else {
                redirect("/r/p/" . $redirect);
            }
        }

        public function p($redirect = null)
        {
            if ($redirect != null) {
                $url = $this->RedirectModel->getUrl($redirect);
                redirect($url);
            }

            if (!$this->hasPermission('redirect.view')) {
                redirect(base_url());
            }

            $returnMessage = '';
            if (isset($_POST['redirectInput']) && !empty($_POST['redirectInput']) && isset($_POST['redirectUrl']) && !empty($_POST['redirectUrl'])) {
                $feedback = $this->redirect->insertRedirect($_POST['redirectUrl'], $_POST['redirectInput']);
                if ($feedback['feedback'] == 'success') {
                    $returnMessage = '<div class="alert alert-success" role="alert"><strong>Umleitung hinzugefügt!</strong> Code: "' . $_POST['redirectInput'] . '" Ziel-Url: "' . $_POST['redirectUrl'] . '"</div>';
                } else {
                    $returnMessage = '<div class="alert alert-danger" role="alert"><strong>Error!</strong> ' . $feedback['message'] . '</div>';
                }
            }

            $this->load->view('header', ['title' => 'Redirect-Manager', 'active' => '']);
            $this->load->view('redirect', ['message' => $returnMessage, 'allItems' => $this->RedirectModel->getItems()]);
            $this->load->view('footer');
        }

    }