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Just to be on the safe side, you should take a snapshot of the server as it is today. That way if you delete anything important, you can always restore back to the working snapshot.
Not sure about the other versions of php
PHPMyAdmin/MySQL - You can uninstall phpmyadmin from your app server, or if you still want to use it, you can update the phpmyadmin config to point at your remote mysql db. (You probably don’t have Apache/PHP installed on your database server.)
PHP connects to your MySQL database using the mysql improved extension, that works the same whether the database is on the same server or not. This means you don’t need to keep mysql installed on your app server.
This tutorial section might help give more context: https://www.digitalocean.com/community/tutorials/building-for-production-web-applications-deploying#set-up-database-server