update php version ubuntu 7 3

1//In ubunutu
2Default PHP 7.1 is set on your system and you need to switch to PHP 5.6
3
4$ sudo a2dismod php7.1
5$ sudo a2enmod php5.6
6$ sudo service apache2 restart
7  
8sudo update-alternatives --set php /usr/bin/php5.6

1sudo apt-get install software-properties-common
2sudo add-apt-repository ppa:ondrej/php
3sudo apt-get update
4sudo apt-get upgrade
5sudo apt-get install -y php7.3
6

1sudo apt install -y php7.4 php7.4-cli php7.4-common php7.4-fpm
2