upgrade php5 to php7 ubuntu 14.04 code example
Example 1: upgrade php to 7.3 ubuntu
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
Example 2: ubuntu 16 upgrade php 7.0 to 7.4
sudo apt install -y php7.4-mysqli php7.4-pdo php7.4-sqlite3 php7.4-ctype php7.4-fileinfo php7.4-zip php7.4-exif