This is a fully functional plugin that does just two things:
- Creates a Multisite Settings page in
Network Admin > Settings > Custom Settings - Saves a "site" option, which is an option that works only in a multisite environment
You need to have composer installed globally and a working WordPress installation.
cd /path/to/wordpress/wp-content/plugins
clone https://github.com/marioy47/wordpress-multisite-settings.git
cd wordpress-multisite-settings
composer install
composer phpcs