title: Sending a checkbox input on off value?
body: <p>I'm trying to submit a checkbox unchecked, when the user uncheck the checkbox, the form should be submitted so my database can record that this user has unchecked it, but when I try, my $_POST['checkbox'] variable is not updated and I don't have an 'off' value as I expect. But when I do the opposite by checking the checkbox, it is updated and a 'on' is set to the variable.</p>
  
  <p>How do I update my variable when I uncheck the checkbox in php ?</p>