ubuntu change php version to 7.3 def code example

Example 1: change php version ubuntu

$ sudo update-alternatives --config php
 or
$ sudo a2enmod php7.1(version)

Example 2: update php version ubuntu 7.3

sudo apt-get install software-properties-common
sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install -y php7.3