我创建了一个有效的购物车对象。但是当我尝试将对象保存到会话中时，会存储该对象的错误内容。保存的值是从购物车中清空对象后的值，即空的。
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Testing the Shopping Cart</title>
</head>
<body>
<?php # cart.php
// This script uses the ShoppingCart and Item classes.
//error_reporting(0);
// Create the cart:
session_start();
try {
require('ShoppingCart.php');
require('userMenu.php');
$cart = new ShoppingCart();
// Create some items:
require('Item.php');
require ('Connect.php');
$conn=Connect::doConnect();
$query = "SELECT product_id, product_name, product_price from product";
$result = mysqli_query($conn, $query);
$i=0;
$w = array();
$new_cart;
if ($result->num_rows > 0) {
// output data of each row
echo '<table border='."1".'><form action="cart.php" method="post"><tr><td>';
echo '<b>'."Id produs".'</td><td><b>'."Denumire".'</td><td><b>'."Pret".'</td><td>'."Numar de bucati solicitate".'</td></tr><tr>';
while($row = $result->fetch_assoc()) {
echo '<td>'.$row["product_id"].'</td><td>'. $row["product_name"].'</td><td>'. $row["product_price"]. '</td><td>
<input type="input" value="0" name="quantity[]"><input type="hidden" value="'.$row["product_id"].'" name="item_adjust[]"></td>';
echo '</tr>';
$i++;
$w[$i]=new Item($row["product_id"], $row["product_name"],$row["product_price"]);
$cart->addItem($w[$i]);
//$cart->deleteItem($w[$i]);
}
echo '</td></tr><tr><td colspan="3"><input type="submit" value="Adauga in cosul de cumparaturi" name="adjQ"></td></tr></table>';
//foreach ()
} else {
echo "0 results";
}
$conn->close();
if($_POST["adjQ"]){
echo "In stoc avem ".$i." tipuri de produse";
// Update some quantities:
$cart_items_new = array_combine($_POST['item_adjust'],$_POST['quantity']);
foreach ($cart_items_new as $product_id=>$quantity){
//$item=new Item($product_id,Item->);
//Item $it;
//->updateItem($item->getId($product_id), $qty);
//$cart->updateItem(getId($product_id), $quantity);
$conn=Connect::doConnect();
$query1 = "SELECT product_id, product_name, product_price from product where
product_id='$product_id'";
$result1 = mysqli_query($conn, $query1);
$row1=mysqli_fetch_array($result1);
if($quantity>0){
$cart->updateItem($w[$product_id], $quantity);
echo $product_id.$quantity."+".$row1["product_name"];
}
else{
$cart->deleteItem($w[$product_id]);
}
}
// Show the cart contents:
echo '<h2>Continutul cosului de cumparaturi (' . count($cart) . ' tipuri de produse)</h2>';
echo "The user is " . $_SESSION["user"] . ".<br>";
echo "User type is " . $_SESSION["user_type"] . ".";
$new_cart = unserialize(serialize($cart));
if (!$cart->isEmpty()) {
foreach ($cart as $arr) {
// Get the item object:
$item = $arr['item'];
// Print the item:
printf('<p><strong>%s</strong>: %d @ $%0.2f bucata.<p>', $item->getName(), $arr['qty'], $item->getPrice());
} // End of foreach loop!
} // End of IF.
}
echo '</td></tr><tr><td colspan="2"><input type="submit" value="Salveaza" name="session"></td><td></td></tr></form></table>';
if ($_POST['session'])
{
echo "You entered the number ";
$serialize_cart=serialize($new_cart);
$_SESSION["cart"]=$serialize_cart;
}
}
catch (Exception $e) {
}
?>
</body>
</html>
当我按下第二个提交按钮时，我做错了什么。
答案 0 :(得分：1)
我有一个Session变量'cart'如果存在我们抓取它反序列化然后完成然后可以编辑值并将其保存回来等等
如果不存在，即第一次点击或购物车被删除，我们从数据库中构建一个新购物车（这不适合测试，因为目前您将数据库中的每个项目添加到购物车？）
如果adjQ的post或get值存在，我们修改cart对象的一些值并将其保存回会话变量
如果showCart的post或get值存在，我们输出当前的购物车 要完成这项工作，您可能需要调整Shopping_Cart对象以支持被调用的变量以及getCount函数和getAllRows函数
我已经从购物车中删除了一系列商品的额外存储空间（w），因为您将数据存储在对象中而不需要复制它，所以不确定这是什么用的
应该清理所有请求变量以防止注入攻击等等
我添加了一个隐藏字段来触发showCart请求
无论如何希望这有帮助
<?php
session_start();
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Testing the Shopping Cart</title>
</head>
<body>
<?php # cart.php
// This script uses the ShoppingCart and Item classes.
//error_reporting(0);
// Create the cart:
require('ShoppingCart.php');
require('userMenu.php');
$rowCount = 0;
if(isset($_SESSION['cart']))
{
echo "We have a stored cart in a Session variable, retrieving data ...";
$cart = unserialize($_SESSION["cart"]);
$rowCount = $cart->getCount();
}
else
{
$cart = new ShoppingCart();
// Create some items:
require('Item.php');
require ('Connect.php');
$conn=Connect::doConnect();
$query = "SELECT product_id, product_name, product_price from product";
$result = mysqli_query($conn, $query);
$rowCount = $result->num_rows;
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
$cart->addItem(new Item($row["product_id"], $row["product_name"],$row["product_price"]));
}
}
$conn->close();
}
if(isset($_REQUEST['adjQ']))
{
echo "In stoc avem ".$rowCount." tipuri de produse";
// Update some quantities:
$cart_items_new = array_combine($_POST['item_adjust'], $_POST['quantity']);
foreach ($cart_items_new as $product_id=>$quantity) {
if($quantity > 0) {
$cart->updateItem($product_id, $quantity);
$conn=Connect::doConnect();
$query1 = "SELECT product_id, product_name, product_price from product where product_id='$product_id'";
$result1 = mysqli_query($conn, $query1);
$row1 = mysqli_fetch_array($result1);
echo $product_id." ".$quantity." + ".$row1["product_name"];
}
else {
$cart->deleteItem($product_id);
}
}
// Show the cart contents:
echo '<h2>Continutul cosului de cumparaturi (' . $rowCount . ' tipuri de produse)</h2>
The user is ' . $_SESSION["user"] . '.<br>
User type is ' . $_SESSION["user_type"] . '.';
if (!$cart->isEmpty()) {
foreach ($cart as $arr) {
// Get the item object:
$item = $arr['item'];
// Print the item:
printf('<p><strong>%s</strong>: %d @ $%0.2f bucata.<p>', $arr['item']->getName(), $arr['item']->getQuantity(), $arr['item']->getPrice());
} // End of foreach loop!
echo "Saving card to Session variable";
//New_cart is only set in adjQ request prehaps this code should be there?
$_SESSION["cart"] = serialize($cart);
} // End of IF.
}
if(isset($_REQUEST['showCart']))
{
if ($cart->getCount() > 0) {
// output data of each row
echo '<table border='."1".'><form action="cart.php" method="post">';
echo '<tr><td><b>'."Id produs".'</td><td><b>'."Denumire".'</td><td><b>'."Pret".'</td><td>'."Numar de bucati solicitate".'</td></tr>';
foreach ($cart->getAllRows() as $row) {
echo '
<tr>
<td>'. $row->getProductId() . '</td>
<td>'. $row->getName() . '</td>
<td>'. $row->getPrice() . '</td>
<td><input type="input" value="0" name="quantity[]"><input type="hidden" value="' . $row->getProductId() . '" name="item_adjust[]"/><input type="hidden" value="showCart" name="showCart"/></td>
</tr>';
}
echo '<tr><td colspan="3"><input type="submit" value="Adauga in cosul de cumparaturi" name="adjQ"></td></tr></table>';
} else {
echo "Cart is empty";
}
}
?>
</body>
</html>