CI-Upgrader will help you to upgrade your CodeIgniter 3 project to CodeIgniter 4.
This Repository shows a simple CodeIgniter 3 application, which was used by CI-Upgrader to create a new CI4 application.
- CI-Upgrader: https://github.com/FlorianNelles/CI-Upgrader
- CI4 application (Upgraded): https://github.com/FlorianNelles/test_ci3_upgrade_to_ci4