To restart the PHP-FPM service and reload the configuration file, firstly check which version of PHP you are running:
PHP 7.2.15-1+ubuntu18.04.1+deb.sury.org+1 (cli) (built: Feb 8 2019 15:38:01) ( NTS ) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies with Zend OPcache v7.2.15-1+ubuntu18.04.1+deb.sury.org+1, Copyright (c) 1999-2018, by Zend Technologies
Above we can see we are running PHP v7.2, therefore the service name should be
To restart the PHP-FPM service, run;
sudo service php7.2-fpm restart
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