From what I see in your link it seems to work properly. When I click on Verwijderen, I see the tables that I have selected (expect there is an error thrown when no month is selected)

@matzeso

yeah but when u select 'januari', 'maart' and 'april' the problem is because of the array you will get the table form 'januari', 'februari' and 'maart' . because of the variable values of the array ( you can check with the array displayd beneath the tables)

$kalender[0] should always have the value 'januari' even if not clicked. hower that value shifts depending on the months that are clicked.

And yes i still need to build in the code when no months are selected.