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i know that we can switch between different version of php in ubuntu with the commands
sudo a2dismod php7.1
sudo a2enmod php5.6
but the mysql requirement for the old and new magento setups are also different , i tried to look for switch between different mysql versions but could not find the anywhere how this can be achieved . i want to setup different magento project on my linux machine , If anyone using the same on linux please let me know.
Database
You can install 2 version of MySQL and serve by different port. Example 3306 for 8.0 and another one for 5.x. Setup host with port in env.php
PHP
Anyway, you will need to link or run with correct PHP version in console. Magento 2.4.4 is still compatible with PHP 7.4 and i don't remember any parts which require 8.1
For webserver I suggest to use nginx + php-fpm with the same logic about ports. Example 9074 for PHP 7.4 and 9000 for 8.1
P.S.
You can try to start to use Docker and it might save some time with software versions in future.
