Question

I have an HTML form – with PHP, I am sending the data of the form into a MySQL database. Some of the answers to the questions on the form have checkboxes. Obviously, the user does not have to tick all checkboxes for one question. I also want to make the other questions (including radio groups) optional.

However, if I submit the form with empty boxes, radio-groups etc, I received a long list of ‘Undefined index’ error messages for each of them.

How can I get around this? Thanks.

Answer 1

Unchecked radio or checkbox elements are not submitted as they are not considered as successful. So you have to check if they are sent using the isset or empty function.

if (isset($_POST['checkbox'])) {     // checkbox has been checked }