This example code is part of the article: Using A Config To Write Reusable Code
This is more of a real OOP implementation of a settings page using the WordPress Settings API. In addition to the previous example, it uses a Config file to make the SettingsPage class truly reusable.
To test this plugin yourself, clone the repository into a wp-content/plugins folder of a WordPress installation, and run the command composer install from within the plugin's folder to generate the autoloader. You should then be able to activate the plugin and get access to the generated settings page via Settings → as-settings-better-v1.
Clicking on this menu entry will bring you to the generated Settings page, which allows you to save two useless settings.
