"); // exit; global $products; if ($quantity < 1) return; // If item already exists in cart, update quantity if (isset($_SESSION['cart13'][$key])) { $quantity += $_SESSION['cart13'][$key]['qty']; update_item($key, $quantity); return; } // Add item $cost = $products[$key]['cost']; $total = $cost * $quantity; $item = array( 'name' => $products[$key]['name'], 'cost' => $cost, 'qty' => $quantity, 'total' => $total ); $_SESSION['cart13'][$key] = $item; } // Update an item in the cart function update_item($key, $quantity) { $quantity = (int) $quantity; if (isset($_SESSION['cart13'][$key])) { if ($quantity <= 0) { unset($_SESSION['cart13'][$key]); } else { $_SESSION['cart13'][$key]['qty'] = $quantity; $total = $_SESSION['cart13'][$key]['cost'] * $_SESSION['cart13'][$key]['qty']; $_SESSION['cart13'][$key]['total'] = $total; } } } // Get cart subtotal function get_subtotal() { $subtotal = 0; foreach ($_SESSION['cart13'] as $item) { $subtotal += $item['total']; } $subtotal_f = number_format($subtotal, 2); return $subtotal_f; } // Get a function for sorting the cart on the specified key function compare_factory($sort_key) { return function($left, $right) use ($sort_key) { if ($left[$sort_key] == $right[$sort_key]) { return 0; } else if ($left[$sort_key] < $right[$sort_key]) { return -1; } else { return 1; } }; } // Sort the cart on the specified key function sort($sort_key) { $compare_function = compare_factory($sort_key); usort($_SESSION['cart13'], $compare_function); } } ?>