removeAll();
$_SESSION['cart'] = serialize($cart);
header('Location: shop.php');
end();
}
// item parameter indicates an attempt to add or remove items
if (isset($_GET['item']))
{
// verify item is valid
$query = sprintf('SELECT ITEM_ID FROM %sSHOP_INVENTORY WHERE ' .
'ITEM_ID = %d',
DB_TBL_PREFIX,
$_GET['item']);
$result = mysql_query($query, $GLOBALS['DB']);
if (mysql_num_rows($result))
{
$row = mysql_fetch_assoc($result);
$item = $row['ITEM_ID'];
// add item to cart
if (isset($_GET['add']))
{
$cart->addItem($item);
}
// remove item from cart
else if (isset($_GET['remove']))
{
$cart->removeItem($item);
}
}
mysql_free_result($result);
// save cart to session and redirect to the previously viewed page
$_SESSION['cart'] = serialize($cart);
header('Location: ' . htmlspecialchars($_SERVER['HTTP_REFERER']));
exit();
}
// view shopping cart's contents
else
{
// update item quantities in shopping cart
if (isset($_GET['update']))
{
foreach ($_POST['qty'] as $item => $qty)
{
$cart->addItem($item, $qty);
}
}
ob_start();
echo 'Your Cart
';
echo 'Back to all categories';
// verify category parameter and construct suitable back link if passed
if (isset($_GET['category']))
{
$query = sprintf('SELECT CATEGORY_ID, CATEGORY_NAME FROM ' .
'%sSHOP_CATEGORY WHERE CATEGORY_ID = %d',
DB_TBL_PREFIX,
$_GET['category']);
$result = mysql_query($query, $GLOBALS['DB']);
if (mysql_num_rows($result))
{
$row = mysql_fetch_assoc($result);
echo ' / Back to ' . $row['CATEGORY_NAME'] . '';
}
mysql_free_result($result);
}
echo '
';
if ($cart->isEmpty)
{
echo 'Your cart is empty.
';
}
else
{
// display empty cart link
echo '';
echo '
';
// encapsulate list in form so quantities may be changed
echo '