Answers for "how to restart php fpm in windows on cmd"

ubuntu restart php-fpm

service php-fpm restart    # typical
service php5-fpm restart   # debian-style
service php7.0-fpm restart # debian-style PHP 7
service php7.2-fpm restart # debian-style PHP 7.2
service php7.4-fpm restart # debian-style PHP 7.4

restart php windows

Win + R type:iisreset

Or, more verbose: iisreset inside a powershell 
opened as administrator - or even inside a Cygwin shell.