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我知道如何更改購物車數組中的數量，但是我正在使用獲取該物料的詳細信息，並且看起來像刷新時發生的，它不再具有該物料的ID而是返回這些錯誤。PHP更改購物車數組中的數量
有沒有辦法在不刷新的情況下加載新的金額？
這裏是我的量增減部分：
<?php
//section 3
if (isset($_POST['item_to_adjust']) && $_POST['item_to_adjust'] != "") {
// execute some code
$item_to_adjust = $_POST['item_to_adjust'];
$quantity = $_POST['quantity'];
$quantity = preg_replace('#[^0-9]#i', '', $quantity); // filter everything but numbers
if ($quantity >= 100) { $quantity = 99; }
if ($quantity < 1) { $quantity = 1; }
if ($quantity == "") { $quantity = 1; }
$i = 0;
foreach ($_SESSION["cart_array"] as $each_item) {
$i++;
while (list($key, $value) = each($each_item)) {
if ($key == "item_id" && $value == $item_to_adjust) {
// That item is in cart already so let's adjust its quantity using array_splice()
array_splice($_SESSION["cart_array"], $i-1, 1, array(array("item_id" => $item_to_adjust, "quantity" => $quantity)));
} // close if condition
} // close while loop
} // close foreach loop
}
?>
這裏是GET部分：
<?php
//render cart
$cartOutput = "";
$cartTotal ="";
if(!isset($_SESSION["cart_array"]) || count($_SESSION["cart_array"]) <1){
$cartOutput = "<h2 align=center'>Your shopping cart is empty</h2>";
}else{
$i = 0;
foreach($_SESSION["cart_array"] as $each_item){
$item_id = $each_item['item_id'];
include_once('config/database.php');
include_once('object/chair.php');
$database = new Database();
$conn = $database->getConnection();
$chair = new Chair($conn);
$chair->id = $each_item['details_id'];
$stmt = $chair->readDetails();
while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
$product_name = $row['chair_name'];
$price = $row['PRICE'];
}
$pricetotal = $price * $each_item['quantity'];
$cartTotal = $pricetotal + $cartTotal;
setlocale(LC_MONETARY, "en_US");
$pricetotal = number_format($pricetotal, 2, '.', '\'');
$cartOutput .="<tr>";
$cartOutput .= "<td>".$product_name."</td>";
$cartOutput .= "<td>$".$price."</td>";
$cartOutput .= '<td><form action="cart.php" method="post">
<input name="quantity" type="text" value="'.$each_item['quantity'].'" size="1" maxlength="2" />
<input name="adjustBtn' . $item_id . '" type="submit" value="change" />
<input name="item_to_adjust" type="hidden" value="' . $item_id . '" />
</form></td>';
// $cartOutput .= "<td>".$each_item['quantity']."</td>";
$cartOutput .= "<td>$".$pricetotal."</td>";
$cartOutput .= '<td><form action="cart.php" method="post"><input name="deleteBtn' . $item_id . '" type="submit" value="X" /><input name="index_to_remove" type="hidden" value="' . $i . '" /></form></td>';
$cartOutput .="</tr>";
$i++;