php购物车问题
include ('book_sc_fns.php');
// The shopping cart needs sessions, so start one
session_start();
@$new = $_GET['new'];
if($new) {
//new item selected
if(!isset($_SESSION['cart'])) {
$_SESSION['cart'] = array();
$_SESSION['items'] = 0;
$_SESSION['total_price'] ='0.00';
}
if(isset($_SESSION['cart'][$new])) {
$_SESSION['cart'][$new]++;
} else {
$_SESSION['cart'][$new] = 1;
}
$_SESSION['total_price'] = calculate_price($_SESSION['cart']);
$_SESSION['items'] = calculate_items($_SESSION['cart']);
}
if(isset($_POST['save'])) {
foreach ($_SESSION['cart'] as $isbn => $qty) {
if($_POST[$isbn] == '0') {
unset($_SESSION['cart'][$isbn]);
} else {
$_SESSION['cart'][$isbn] = $_POST[$isbn];
}
}
$_SESSION['total_price'] = calculate_price($_SESSION['cart']);
$_SESSION['items'] = calculate_items($_SESSION['cart']);
}
do_html_header("Your shopping cart");
if(($_SESSION['cart']) && (array_count_values($_SESSION['cart']))) {
display_cart($_SESSION['cart']);
} else {
echo "there are no items in your cart
";
}
$target = "index.php";
// if we have just added an item to the cart, continue shopping in that category
if($new) {
$details = get_book_details($new);
if($details['catid']) {
$target = "show_cat.php?catid=".$details['catid'];
}
}
display_button($target, "continue-shopping", "Continue Shopping");
// use this if SSL is set up
// $path = $_SERVER['PHP_SELF'];
// $server = $_SERVER['SERVER_NAME'];
// $path = str_replace('show_cart.php', '', $path);
// display_button("https://".$server.$path."checkout.php",
// "go-to-checkout", "Go To Checkout");
// if no SSL use below code
display_button("checkout.php", "go-to-checkout", "Go To Checkout");
do_html_footer();
?>
代码中的$_SESSION['cart'][$new]是什么意思，为什么要这样子做？
