$item):
$product = get_product_by_id($item['product_id']);
$is_available = ($product !== null);
if (!$is_available) {
$has_unavailable_items = true;
$product = array(
'id' => $item['product_id'],
'name' => 'Product ' . ucfirst($item['product_id']),
'price' => $item['single_price'],
'image_url' => 'assets/images/default.jpg',
'specs' => array(),
'thai_specs' => array()
);
}
$item_total = $item['single_price'] * $item['quantity'];
$subtotal += $item_total;
?>