php -S localhost:80
PHP 7.1.7 Development Server started at Fri Jul 14 15:11:05 2017
Listening on http://localhost:80
Document root is C:\projetos\repgeral
Press Ctrl-C to quit.
This is the simplest way to start a PHP server that responds to request made to localhost at the port 80.
The -S tells that we are starting a webserver.
The localhost:80 indicates the host that we are answering and the port. You can use other combinations like: