I had exactly the same issue and I have did as you guys mentioned. All of this has happened when my friend moved my sites to a different server.
Now I get bunch of new errors as you can see here.
(link removed)
Here is my phpinfo file: (link removed)
However, it's safe to say that I did not upgrade my prestashop for a very long time as I'm running 1.7.4.3 - it might have viruses all over it too.