PHP does not work after upgrading KUBUNTU 16.04 to 18.04

PHP does not work after upgrading KUBUNTU 16.04 to 18.04

After a little adventure with Virtualbox, which automatically turned some files from 5.1.xx to 5.2.xx, it was time to see what happened to the localhost…. Part of the PHP code appeared and of course did not work, at least completely. I first checked with the...