Getting Checkbox form value to DB

PHP
1

Hi,
I am trying to create a checkbox form to pass a value of ‘-1’ to a field called ‘absence’ in a table called ‘notes’.
The form is as follows,

	<form action="addnotes" method="post">
	<div>
	Absence: <input type="checkbox" name="absence" id="absence" value="-1">
	</div>
	<div>
	<!-- <input type="hidden" name="id" value="unsure"> -->
	<input type="submit" value="Add notes">
	</div>
	</form>

The index.php file,

if (isset($_GET['addnotes']))
{
  include $_SERVER['DOCUMENT_ROOT'] . '/artgibney/includes/db.inc.php';

  try
  {
    $sql = 'INSERT INTO notes SET
        absence = :absence';
    $s = $pdo->prepare($sql);
    $s->bindValue(':absence', $_POST['absence']);
    $s->execute();
  }
  catch (PDOException $e)
  {
    $error = 'Error adding submitted absence.';
    include 'error.html.php';
    exit();
  }

  header('Location: .');
  exit();
}

I think $_POST[‘absence’] should equal ‘-1’ when the checkbox is checked and the form submitted.
But I just get a 404 Error page.
Any help would be greatly appreciated.
Thanks,
Shane

2

Ahhh! I am so stupid!
There should be a question mark ‘?’ infront of the empty variable ‘addnote’ in the form, like this,

	<form action="?addnotes" method="post">

Thanks,
Shane