One of my projects recently migrated domains over a weekend. I was concerned that many of the users (who are mostly very non-technical and use tablets to access the site) would panic and stop using the site if they didn't already know about the new domain. I could have done a permanent redirect to the index of the new domain but I know some user…

redirect.php

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

class Redirect extends CI_Controller {

  function __construct() {
       parent::__construct();
   }
  
  public function index()
  {
    $destination_uri = uri_string();
    // Stop auto redirect once it's 2014
    // Hopefully this annoys people enough to change their bookmarks before the site is totally gone
    // Don't worry - there's still a link
    $year = (int) date('y');
    $auto_redirect = ($year <= 13);

    $this->data['destination_base_url'] = "http://newsite.com/";
    $this->data['destination_uri'] = $destination_uri;
    $this->data['auto_redirect'] = $auto_redirect;

    // Loads css and sets up basic html scaffold and content div
    $this->load->view('common/noAuthHeader',$this->data);
    // Redirector view (redirector.php)
    $this->load->view('common/redirector',$this->data);
    // Loads any required js and closes content, body, html
    $this->load->view('common/noAuthFooter',$this->data);
  }

} // end of Redirect

/* End of file redirect.php */
/* Location: ./application/controllers/redirect.php */

redirector.php

<div class="row-fluid">
  <div class="span6 offset3 center-align">
    <h2>This site has moved!</h2>
    <h4>It is now located at <a href="<?=$destination_base_url.$destination_uri?>"><?=$destination_base_url?></a></h4>
    <p>Please update your bookmarks to the new site.</p>
    <?php
      if ($auto_redirect) {
    ?>
      <p>You will be automatically redirected in 10 seconds.</p>
      <script type="text/javascript">
      setTimeout(function () {
       window.location.href = "<?=$destination_base_url.$destination_uri?>"; //will redirect to the correct page on the new site
      }, 10000); //will call the function after 10 secs.
      </script>
    <?php
      }
    ?>
  </div>
</div>

routes.php

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
  
  // default controller route is required
  $route['default_controller'] = "redirect";
  
  //Handle all requests through the redirect controller
  $route['(.*)'] = "redirect/index/$1";

/* End of file routes.php */
/* Location: ./application/config/routes.php */