If you want to build Admin Panel, CMS , Administrator System or Backend you can use this Codeigniter framework with AdminLTE template. We are also added login authentication and CRUD systems to users so you just need to focus on the other features you want.
Demo https://codecanyon.net/item/codeigniter-with-adminlte-integration-user-crud/20752434
Downloadhttps://www.filecad.com/e15o/Codeigniter-with-AdminLTE-Integration-+-Login-Authentication-+-User-CRUD.rar