hmm, it would be normal that the look and feel stayed exactly as is with only a php upgrade.
Php is just what kind of engine runs on the server to generate html content from the database.
Not much to do with the design or style of a site. Upgrading this would give the devs more options, better performance and better security.
But also means that some of their old code might need restructuring in order for the site to keep working.
However, when I check the php version this forum runs on, it says its 5.4.16
A php version that was released in 2013.
There are 2 main branches of php. A php 5 and a php 7.
Of the v5 branch, the latest release would be 5.6.x.
So perhaps the upgrade hasn’t worked out and that’s why the down time errors where longer than necessary.