Ok have the element names like this...
Code:
name="field[$userid]"
PHP Code:
foreach ($_POST['positions'] as $userid => $position)
{
$userid = intval($userid);
$position = mysql_real_escape_string($position);
$hours = intval($_POST['hours'][$userid]);
$lot = mysql_real_escape_string($_POST['lots'][$userid]);
$result = mysql_query("
UPDATE tablename
SET
position = '$position',
hours = $hours,
lot = '$lot'
WHERE userid = $userid
");
if (!$result) die(mysql_error());
}