How come checkbox state is not always passed along to PHP script?

Question

I have an HTML form:

   Check me!

         


        

Answer 1

nickf provided the best answer, but it won't work in the special case when you have multiple checkboxes with the same name. Instead (if you're using jQuery), you can use a fake checkbox to toggle the value of a real, hidden input like so:

Note that only the hidden checkboxes are named.