<?php
namespace Concrete\Package\Mypackage;
 
class Controller extends Package {
   protected $pkgHandle = 'mypackage';
   protected $appVersionRequired = '5.7.5';
   protected $pkgVersion = '0.1';
 
   public function getPackageName () {
      return t("My Package");
   }
 
   public function getPackageDescription () {
      return t("My Package");
   }
 
        public function on_start () {
      Events::addListener('on_page_version_approve', function ($event {
         $page = $event->getPageObject();
// Do some stuff with $page->cPath to figure out which branch in the site map you are working //with and feed that into the above code:
                         $path = somefunction($page->cPath);
// Add the above code to sort the pages here:
                         $pl = new PageList();
                         $pl->filterByPath($path);
                         $pl->sortByName();
                         $pages = $pl ->get();
                         if ($pages && is_array($pages)){
                        foreach ($pages as $displayOrder => $page) {
                       $page->updateDisplayOrder($displayOrder, $page->cID);
                        }
                         }
                });
       }
}