Ubuntu 16.04 - Install PHP 7.2 From PPA

sudo apt update
sudo apt install python-software-properties -y
sudo add-apt-repository ppa:ondrej/php -y
sudo apt update
sudo apt install php7.2 -y

References

• Tecadmin - How to Install PHP 7.2, 7.1, 7.0 on Ubuntu 17.10, 16.04, 14.04 using PPA