PHATTO© is an atto* PHP server.
composer create-project supremacia/phatto
cd phatto/public php -S localhost:80
http://localhost in your browser.
See this running at https://phatto.ga (soon we will have the manual, a chat, push messages ... to connect the users :)
Att.: A ServiceWorker will be registered in your browser and the application will be cached locally. It is also possible, if installed on a host with "https", the installation as an Android application (smartphone). The intent is to provide the basis for a PWA application (such as an app with notification (push), cache, etc.)
More information coming soon!
* Atto (symbol a) is a unit prefix in the metric system denoting a factor of 10−18... (https://en.wikipedia.org/wiki/Atto-)