【发布时间】：2018-06-16 16:54:51
【问题描述】：
根据标题，我在将产品添加到购物车时遇到了问题：它会显示一条窗口消息，说明产品已添加，但实际上它不存在。它给出了以下错误：
致命错误：不能使用 stdClass 类型的对象作为数组
the line is: <td><?php echo $value['item_name']; ?></td>
这里是代码文件reserve.php：
<?php
session_start();
ini_set('display_errors', 1);
$connect = mysqli_connect('127.0.0.1', 'root', '***********', 'Community Garden List');
if (isset($_POST['add'])) {
if (isset($_SESSION['cart'])) {
$item_array_id = array_column($_SESSION['cart'], 'product_id');
if (!in_array($_GET['id'], $item_array_id)) {
$count = count($_SESSION['cart']);
$item_array = array(
'product_id' => $_GET['id'],
'item_name' => $_POST['hidden_name'],
'product_price' => $_POST['hidden_price'],
'item_quantity' => $_POST['quantity'],
);
$_SESSION['cart'][$count] = $item_array;
echo '<script>window.location="reserve.php"</script>';
} else {
echo '<script>alert("Product is already Added to Cart")</script>';
echo '<script>window.location="reserve.php"</script>';
}
} else {
$item_array = array(
'product_id' => $_GET['id'],
'item_name' => $_POST['hidden_name'],
'product_price' => $_POST['hidden_price'],
'item_quantity' => $_POST['quantity'],
);
$_SESSION['cart'][0] = $item_array;
}
}
if (isset($_GET['action'])) {
if ($_GET['action'] == 'delete') {
foreach ($_SESSION['cart'] as $keys => $value) {
if ($value['product_id'] == $_GET['id']) {
unset($_SESSION['cart'][$keys]);
echo '<script>alert("Product has been Removed...!")</script>';
echo '<script>window.location="reserve.php"</script>';
}
}
}
}
?>
?>
html代码
<?php
$query = 'SELECT * FROM product ORDER BY serial ASC';
$result = mysqli_query($connect, $query);
if (mysqli_num_rows($result) > 0) {
while ($row = mysqli_fetch_array($result)) {
?>
<div class="col-md-4">
<form method="post" action="reserve.php?action=add&id='.$row['id'].">
<div style="border: 1px solid #eaeaec; margin: -1px 19px 3px -1px; box-shadow: 0 1px 2px rgba(0,0,0,0.05); padding:10px;" align="center">
<img src="<?php echo $row['image']; ?>" class="img-responsive" style="width:100%;>
<h5 class="text-info"><?php echo $row['pname']; ?></h5>
<h5 class="text-danger">€ <?php echo $row['price']; ?></h5>
<h5 class="text-info"><?php echo $row['pdescription']; ?></h5>
<input type="text" name="quantity" class="form-control" value="1">
<input type="hidden" name="hidden_name" value="<?php echo $row['pname']; ?>">
<input type="hidden" name="hidden_price" value="<?php echo $row['price']; ?>">
<input type="hidden" name="hidden_pdescription" value="<?php echo $row['pdescription']; ?>">
<input type="submit" name="add" style="margin-top:5px;" class="btn btn-success" value="Add to Bag">
</div>
</form>
</div>
}
}
?>
<?php
if(!empty($_SESSION["cart"])){
$total = 0;
foreach ($_SESSION["cart"] as $key => $value) {
?>
<tr>
<td><?php echo $value["item_name"]; ?></td>
<td><?php echo $value["item_quantity"]; ?></td>
<td>$ <?php echo $value["product_price"]; ?></td>
<td>
$ <?php echo number_format($value["item_quantity"] * $value["product_price"], 2); ?></td>
<td><a href="Cart.php?action=delete&id=<?php echo $value["product_id"]; ?>"><span
class="text-danger">Remove Item</span></a></td>
</tr>
<?php
$total = $total + ($value["item_quantity"] * $value["product_price"]);
}
?>
<tr>
<td colspan="3" align="right">Total</td>
<th align="right">$ <?php echo number_format($total, 2); ?></th>
<td></td>
</tr>
<?php
}
?>
</table>
</div>
</div>
我在这行之后尝试了print "<pre>"; var_dump($row); exit;：foreach e($_SESSION['cart'] as $key => $value) {，它带有一个里面有NULL 的表格。这是什么意思？
在此之前，我尝试将 $value['item_name'] 更改为 $value->item_name ，但出现以下错误：
注意：未定义的属性：stdClass::$item_name in
请您帮我了解一下问题所在吗？谢谢。
【问题讨论】：