Duh! Making the checkbox work. (Part 2)

In addition, each item listed needed to be defined in an array:

<input type="checkbox" name="entry[]" value="$row[0]"/>

Then you can call it like this:

$entry = $_POST['entry'];
foreach($entry as $checked)
{
$SqlStatement1 = "UPDATE database_01 SET checked=1 WHERE id=$checked";