Deathmachine

I restart a project of mine which use mysql, I used xampp in the past to test the code on the mysql server so I update to lasted version but a piece of code that is identical and was working, I now get an error in [U]the class check in …

I was wondering if anyone could point me what coding feature I'm talking about that can fulfill this role. - So I need to update data values from many users at the same time at a specific X amounts of time or specific hours of the day. What programing process …