install-php7.2-ubuntu16.04

install-php7.2-ubuntu16.04

// update ubuntu
sudo apt update

// add PHP repository 
sudo apt-get install software-properties-common python-software-properties
or
sudo apt-get install software-properties-common

sudo add-apt-repository -y ppa:ondrej/php

// update ubuntu
sudo apt update

// install php 7.2
sudo apt install php7.2-common php7.2-cli php7.2-fpm php7.2-opcache php7.2-gd php7.2-mysql php7.2-curl php7.2-intl php7.2-xsl php7.2-mbstring php7.2-zip php7.2-bcmath php7.2-soap

// check status php7.2
sudo service php7.2-fpm status