- if (is_numeric($_POST['listing_amount'])) $listing_amount=$_POST['listing_amount'];
- elseif (!empty($_SESSION['listing_amount'])) $listing_amount=$_SESSION['listing_amount'];
- else $listing_amount=DEFAULT_LISTING_AMOUNT;
+ if (isset($_POST['listing_amount']) &&
+ (is_numeric($_POST['listing_amount']))) {
+ $listing_amount=$_POST['listing_amount'];
+ } elseif (!empty($_SESSION['listing_amount'])) {
+ $listing_amount=$_SESSION['listing_amount'];
+ } else $listing_amount=DEFAULT_LISTING_AMOUNT;