Generating Database Configuration File

Have you though about .env files? You can generate them relatively easy and load them with PHP getenv function.

Check this out: https://github.com/josepostiga/Codeigniter-env-support

The problem isn't to identify the environment of application, the main problem how I should create a step-by-step installation (please enter with database server...,enter with your database user...., enter your database password..., please enter with your url of site...) then confirm this fields for example, the application will be put this information in files config.php and database.php.