https://www.vultr.com/docs/how-to-install-apache-mysql-and-php-on-ubuntu-17-04

sudo /usr/bin/mysql_secure_installation

LC_ALL=C.UTF-8 add-apt-repository ppa:ondrej/php
apt install php7.3-fpm php7.3-cli php7.3-common php7.3-mysql php7.3-mysqlnd php7.3-xml php7.3-dom php7.3-intl php7.3-gd
a2enmod http2
apachectl restart
a2enmod proxy_fcgi setenvif
a2dismod php7.3
a2dismod mpm_prefork
a2enmod mpm_event
a2enconf php7.3-fpm
systemctl reload apache2

a2ensite