未定义的数组键"quantity"出现在C:\xampp\htdocs\login\cart-item.php中
P粉549412038
2023-09-05 20:18:59
[PHP讨论组]
<p>我正在按照教程视频进行操作，但是数据库中没有输出表格。我按照视频中的每一步操作。我还尝试将数量初始化为变量，但仍然无法工作</p>
<pre class="brush:php;toolbar:false;"><?php
session_start();
$connect = mysqli_connect("localhost", "root", "", "login_sample_db");
if(isset($_POST['add_to_cart'])){
if(isset($_SESSION['cart'])){
$session_array_id = array_column($_SESSION['cart'], "id");
if(!in_array($_GET['id'], $session_array_id)){
$session_array = array(
'id' => $_GET['id'],
"name" => $_POST['name'],
"price" => $_POST['price'],
"quantity" => $_POST['quantity']
);
$_SESSION['cart'][] = $session_array;
}
}else{
$session_array = array(
'id' => $_GET['id'],
"name" => $_POST['name'],
"price" => $_POST['price'],
"quantity" => $_POST['quantity']
);
$_SESSION['cart'][] = $session_array;
}
}
?>
<!DOCTYPE html>
<html>
<head>
<title>Products</title>
<link rel="stylesheet" type="text/css" href="styles.css">
<link rel="stylesheet" type="text/css" href="cart-item.css">
<style>
</style>
</head>
<body>
<div class="container-fluid">
<div class="col-md-12">
<div class="row">
<div class="col-md-6">
<h2 class="text-center">购物车数据</h2>
<div class="col-md-12">
<div class="row">
<?php
$query = "SELECT * FROM cart_item";
$result = mysqli_query($connect, $query);
while($row = mysqli_fetch_array($result)){
?>
<div class="col-md-4">
<form method="post" action="cart-item.php?id=<?= $row['id'] ?>">
<h5 class="text-center"><?= $row['name']; ?></h5>
<h5 class="text-center">$<?= number_format($row['price'], 2); ?></h5>
<input type="hidden" name="name" value="<?= $row['name'] ?>">
<input type="hidden" name="price" value="<?= $row['price'] ?>">
<input type="number" name="quantity" value="1" class="form-control">
<input type="submit" name="add_to_cart" class="btn btn-warning btn-block my-2" value="添加到购物车">
</form>
</div>
<?php
}
?>
</div>
</div>
</div>
<div class="col-md-6">
<h2 class="text-center">已选择的商品</h2>
<?php
$total = 0;
$output = "";
$output .= "
<table class='table table-bordered table-striped'>
<tr>
<th>ID</th>
<th>商品名称</th>
<th>商品价格</th>
<th>商品数量</th>
<th>总价格</th>
<th>操作</th>
</tr>
";
if(!empty($_SESSION['cart'])){
foreach($_SESSION['cart'] as $key => $value){
$output .= "
<tr>
<td>".$value['id']."</td>
<td>".$value['name']."</td>
<td>".$value['price']."</td>
<td>".$value['quantity']."</td>
<td>$".number_format($value['price'] * $value['quantity'])."</td>
<td>
<a href='cart-item.php?action=remove&id=".$value['id']."'>
<button class='btn btn-danger btn-block'>移除</button>
</a>
</td>
</tr>
";
$total = $total + $value['quantity'] * $value['price'];
}
$output .= "
<tr>
<td colspan='3'></td>
<td></b>总价格</b></td>
<td>".number_format($total, 2)."</td>
<td>
<a href='cart-item.php?action=clearall'>
<button class='btn btn-warning btn-block'>清空</button>
</a>
</td>
</tr>
";
}
echo $output;
?>
</div>
</div>
</div>
</div>
</body>
</html></pre>
<p>我多次检查了数量数组键并与视频进行比较，与视频中的相同。我还应该尝试什么其他的东西吗？数据库中的表格也没有包含数量</p>
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如果我了解更多细节，我会发表评论的，但你确定你的数据库架构和表定义正确吗？你的
INSERT/UPDATE逻辑在哪里？错误发生在哪里，具体是什么错误？请提供更多信息。