我试图编写一个允许用户输入产品数量的购物篮，然后点击按钮添加到购物车。当我点击添加到购物车按钮但没有任何反应。代码如下所示：
<?php
session_start();
$connect = mysqli_connect("localhost", "root", "", "stock");
if(isset($_POST["add_to_cart"]))
{
if(isset($_SESSION["shopping-cart"]))
{
$_item_array_id = array_column($_SESSION["shopping-cart"],
"item_id");
if(!in_array($_GET["id"], $item_array_id))
{
$item_array = array(
'item_id' => $_GET["id"],
'item_product' => $_POST["hidden_product"],
'item_price' => $_POST["hidden_price"],
'item_quantity' => $_POST["quantity"]
);
array_push($_SESSION['shopping_cart'], $item_array);
}
else
{
echo '<script>alert("Item has already been added to your
shopping basket")</script>';
echo '<script>window.location="ShoppingCart.php"</script>';
}
}
else
{
$item_array = array(
'item_id' => $_GET["id"],
'item_product' => $_POST["hidden_product"],
'item_price' => $_POST["hidden_price"],
'item_quantity' => $_POST["quantity"]
);
$_SESSION["shopping-cart"][0] = $item_array;
}
}
if(isset($_GET["action"]))
{
if($_GET["action"] == "delete")
{
foreach($_SESSION["shopping_cart"] as $keys => $values)
{
if($values["item_id"] == $_GET["id"])
{
unset($_SESSION["shopping-cart"][$keys]);
echo '<script>alert("Item removed from cart")</script>';
echo '<script>window.location="ShoppingCart.php"</script>';
}
}
}
}
?>
<!doctype html>
<html lang="en">
<head>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-
target="#navbarSupportedContent" aria-controls="navbarSupportedContent"
aria-
expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="HomePage.php">Home <span class="sr-only">
(current)</span></a>
</li>
<li class="nav-item active">
<a class="nav-link" href="CDPage.php">Shop</a>
</li>
<li class="nav-item active">
<a class="nav-link" href="About.php">About</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search"
aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0"
type="submit">Search</button>
</form>
</div>
</nav>
<div class = "container>
<?php
$query = "SELECT * FROM stock ORDER BY ID 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 = "shoppingcart.php?
action=add&id=<?php echo $row["id"];?>">
<div style="border:10px solid background-color:blue
border-radius:5px padding: 50px" align = "center">
<img src="<?php echo $row["image"];?>" class = "img-
responsive" ><br/>
<h4 class = "text-info"><?php echo $row["product"];?
></h4>
<p class="text-info"><?php echo
$row["description"];?>
<h4 class = "text-danger">€ <?php echo $row["price"];?>
</h4>
<input type="text" name="quantity" class="form-control"
value = "1" >
<input type="hidden" name="hidden_product" value = "<?
php echo $row["product"];?>" >
<input type="hidden" name="hidden_price" value = "<?php
echo $row["price"];?>" >
<input type="submit" name="add_to_cart" style="margin-
top:5px ;" class="btn btn-success" value="Add To Cart" >
</div>
</form>
</div>
<?php
}
}
?>
<div style="clear:both"></div>
<br />
<h3>Order Details</h3>
<div class="table-responsive">
<table class="table table-bordered">
<tr>
<th width="40%">Product Name</th>
<th width="10%">Quantity</th>
<th width="20%">Price</th>
<th width="15%">Total</th>
<th width="5%">Action</th>
</tr>
<?php
if(!empty($_SESSION["shopping-cart"]))
{
$total = 0;
foreach($_SESSION["shopping_cart"] as $keys => $values)
{
?>
<tr>
<td><?php echo $values["item_product"]; ?></td>
<td><?php echo $values["item_quantity"]; ?></td>
<td>€ <?php echo $values["item_price"]; ?></td>
<td><?php echo
number_format($values["item_quantity"] * $values["item_price"], 2); ?>
</td>
<td><a href="shoppingcart.php?action=delete&id=<?php
echo $values["item_id"]; ?>"><span class="text-danger">Delete</span></a>
</tr>
<?php
$total = $total + ($values["item_quantity"] *
$values["item_price"]);
}
?>
<tr>
<td colspan="3" align="right">Total</td>
<td align="right">€ <?php echo number_format($total, 2);
?></td>
<td></td>
</tr>
<?php
}
?>
</table>
<a href="CheckoutPage.php" class="btn btn-success btn-lg active"
role="button" aria-pressed="true">Checkout</a>
</div>
</div>
</body>
</html>
在尝试此尝试之前，我几乎没有使用PHP编写代码的经验，所以我很确定问题就在那里。 我最初试图把购物车放在一个单独的页面上，但我根本无法得到它，这是我到目前为止最接近的。