How can i use the php built in server

I am trying to use the built in php server. When initiating the server with the following line: php -S localhost:8000, i get the error: "php is not a reconized as an internal or external command, operable program or batch file". I'm currenty using windows 10.

source https://stackoverflow.com/questions/67862499/how-can-i-use-the-php-built-in-server