Switch PHP version in Ubuntu OS or Zorin OS

First check where is installed your PHP by the below command:

$ which php

See PHP version by below command:

$ php -v

As I've installed PHP version 7.4 and 8.1. I will try to install another PHP version 

and that is 8.2, then we'll switch from 8.1 to 8.2.

Add a software package to install new version or older version of PHP by below command:

$ sudo apt install software-properties-common

Now run the below command to add that repository:

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

Now install PHP 8.2 by below command:

$ sudo apt install php8.2

Now you need to switch PHP version, first run by below command to see PHP list:

$ sudo update-alternatives --config php

And then finally you can switch PHP version by entering selection number and hit enter.

.:Happy Coding:.