What php level is needed for web form builder

Thanks

Version 5.6 I think.

5.3 or above.

But now, with WFB 2.9 build 5553 and a host that give me the choice of PHP 7.2, 7.3 or 7.4 I've got a warning by submitting a form...

Your form could not be submitted for the following reason(s):
Warning: [ err 2/line 445/datasavemysql.cls.php] A non-numeric value encountered

The form is saved in the table, but there is no confirmation page after submitting

I think it is an PHP version issue, because of the movement to another server this weekend causes the problem, which had never showed up before on the other server with PHP 7.0

Back again, it is solved by deleting the table.
After submitting a new filled form, the waring is not showing and the user gets the confirmation page.

Thanks for the update.