Chat over your local network: 127.0.0.1

#Howto:

install packages:

apache2

(or nginx but I wouldn't prefer it if you're using your local computer)

php

for ubuntu/debian instance: $ apt install apache2 php -y

move index.php into webroot folder (default): /var/www/html $ mv index.php /var/www/html

give perm if you want to (for full permission): $ chmod 777 -R .

to view: $ firefox 127.0.0.1