多维数组

Question

我有一个在购物车中添加定制客串的功能。购物车存储在会话变量中。如果客户决定构建完全相同的客串，我不想向数组中添加另一个条目，我只希望能够在所述产品的数量上再添加1个条目。问题是，当脚本到达检查数组中是否存在这些值的时候，它会返回false，并向数组中添加一个新条目。我是php的新手，所以我不确定我的做法是否正确。

function AddToCart($subpid,$subtype,$subprice,$subtotal,$subcarving,$subline1,$subline2){
    global $form;

    $exist = false;
    $i=0;

    if(!isset($_SESSION['cart'])){
        $_SESSION['cart'] = array(0 => array("Product ID" => $subpid, "Type" => $subtype, "Price" => "$".$subprice, "Subtotal" => "$".$subtotal, "Carving" => $subcarving, "Line 1" => $subline1, "Line 2" => $subline2, "Quantity" => 1));
    }
    else{
        foreach($_SESSION['cart'] as $item){
            $i++;
            while(list($key,$value) = each($item)){
                /* If product exist add 1 to quantity */
                if($key == "Product ID" && $value == $subpid && $key == "Type" && $value == $subtype && $key == "Price" && $value == "$".$subprice && $key == "Subtotal" && $value == "$".$subtotal  && $key == "Carving" && $value == $subcarving && $key == "Line 1" && $value == $subline1 && $key == "Line 2" && $value == $subline2){
                    array_splice($_SESSION['cart'], $i-1, 1, array(array("Product ID" => $subpid, "Type" => $subtype, "Price" => "$".$subprice, "Subtotal" => "$".$subtotal, "Carving" => $subcarving, "Line 1" => $subline1, "Line 2" => $subline2, "Quantity" => $item['Quantity'] + 1)));
                    $exist = true;
                }
            }
        }
        if($exist == false){
            array_push($_SESSION['cart'], array("Product ID" => $subpid, "Type" => $subtype, "Price" => "$".$subprice, "Subtotal" => "$".$subtotal, "Carving" => $subcarving, "Line 1" => $subline1, "Line 2" => $subline2, "Quantity" => 1));
        }
    }
    return 0;
}

如果我只是使用：$key ==“产品ID”&& $value == $subid，它将返回true并更新数量，但问题是如果客户购买了两个具有相同id但不同雕刻的客串，或雕刻我的车将关闭。

Answer 1

它不起作用，因为您使用&&语句同时比较每个键，但每次循环遍历每个键。去掉while循环，就像这样比较：

if( $item['Product ID'] == $subpid ... //etc ) {

}

此外，您不需要array_splice，只需更新项目即可。

Answer 2

我觉得你把事情搞得更复杂了……

我会这样设置购物车阵列：

$cart[0]["name"] = "whatever";
$cart[0]["ProductID"] = "1234";
$cart[0]["price"] = 0.00;
$cart[0]["quantity"] = 1;
$cart[0]["options"] = array(
     "subcarving" => "asdf",
     "subline1"   => "asdfsafd",
     "subline2"   => "asfdsadfdf");

然后你可以像这样用简单的循环来处理它：

$didadd = 0;
for($x = 0; $x < sizeof($cart); $x++) {
    if($subid == $cart[$x]["ProductID"]) {
        // check options
        $sameOpts = 1;
        foreach($cart[$x]["options"] as $key => $val) {

            if($val != ${$key}) { // checks if the current items option[val] = function(val)
                $sameOpts = 0;
            }

        }

        if($sameOpts) {
            $didadd = 1; // sets the flag that we added the element.
            // increase quantity since the product id and options matched.

        } else {
            $didadd = 1;
            // add new element
            // sets the flag that we added the element
        }

    }
} 

if(!$didadd) { 
    // still need to add the item
    // do code to create new $cart item here.

}