How to roll back to php 5.6?

Question

PHP

For the site to work, versions of php 5.6 and mysql 5.6 are required
Initially, php was 5.6, but during the installation of php-fpm it was updated to 7.2
Now, trying to roll back to 5.6, nothing comes out of the Internet according to the manuals:
5.6 version has already been downloaded, like php-fpm
https://pastebin.com/qv7a043Z
And you also need to roll back to mysql 5.6, now 5.7

Answer 1

From the internets:

you purge what you need, then you crawl into the package cache and look for the versions you need. if the cache is cleared, then SSZB

Answer 2

what os
what web panel?

Answer 3

sudo apt remove php7.2
sudo apt install php5.6 put
in snap php-fpm https://github.com/nextcloud/nextcloud-snap/blob/m...