我正在创建一个有两个网页的购物车; purchase.php（您可以在其中查看所有可用产品列表并将其添加到购物车中）和cart.php（您可以在其中查看已添加的所有项目并删除项目或清除所有购物车，以及项目的总和）
这是我在purchase.php中的代码：
<?php session_start();
?>
<!DOCTYPE html>
<html lang="en">
<head>
<title>Purchase</title>
<link rel = "stylesheet" href="bootstrap/css/bootstrap.css">
<!-- Styles -->
<link href="css/bootstrap-combined.min.css" rel="stylesheet">
<link href="datatable-bootstrap.css" rel="stylesheet">
<!-- JS -->
<script src="js/jquery.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<script src="js/jquery.dataTables.min.js"></script>
<script src="datatable-bootstrap.js"></script>
<?php
require('config/db_conn.php');
$fetch = mysql_query("SELECT * FROM product") or die(mysql_error());
if(!empty($_POST["add"])) {
$productByCode = mysql_query("SELECT * FROM product WHERE p_code='" . $_POST["p_code"] . "'");
$itemArray = array($productByCode["p_code"]=>array('name'=>$productByCode["p_name"], 'code'=>$productByCode["p_code"], 'quantity'=>$_POST["quantity"], 'price'=>$productByCode["p_price"]));
if(!empty($_SESSION["cart_item"])) {
if(in_array($productByCode["p_code"],$_SESSION["cart_item"])) {
foreach($_SESSION["cart_item"] as $k => $v) {
if($productByCode["p_code"] == $k)
$_SESSION["cart_item"][$k]["quantity"] = $_POST["quantity"];
}
} else {
$_SESSION["cart_item"] = array_merge($_SESSION["cart_item"],$itemArray);
}
} else {
$_SESSION["cart_item"] = $itemArray;
}
}
?>
</head>
<style type="text/css">
body
{
background-color: #6BBEE4;
}
th
(
text-align:center;
)
td
(
align:center;
)
.text-center
{
text-align: center !important;
}
img
{
height: 200px;
width: 200px;
}
.hide
{
visibility: none;
}
.quantitySize
{
width: 90px;
}
.pull
{
margin-left: 220px;
margin-top: -360px;
position: absolute;
}
</style>
<body>
<nav class="navbar navbar-inverse ">
<div class="container-fluid ">
<div class="navbar-header">
<a class="navbar-brand" href="home.php" >MyComputer</a>
</div>
<div>
<ul class="nav navbar-nav navbar-right">
<li><a href="home.php">Home</a></li>
<li class="active"><a href="purchase.php">Purchase</a></li>
<li><a href="cart.php"><span class="glyphicon glyphicon-shopping-cart"></span> Cart</a></li>
<li><a href="logout.php"><span class="glyphicon glyphicon-log-out"></span> Logout</a></li>
</div>
</div>
</nav>
<?php while($result=mysql_fetch_array($fetch)) { ?>
<div class="well form-container-">
<form method = "post" action="cart.php?action=add&code=<?php echo $result['p_code']?>">
<div class="form-group"><img src="<?php echo $result['p_image']?>"></div>
<div class="form-group"><?php echo $result['p_name']?></div>
<div class="form-group"><?php echo $result['p_code']?></div>
<div class="form-group"><?php echo $result['p_price']?></div>
<div class="form-group"><input class="quantitySize" type="text" name="quantity" value="1"/> <input type = "submit" class="btn btn-primary" name="add" value="Add to Cart"></div>
</form>
<form class="pull">
<div class="form-group"><p><?php echo $result['p_desc']?></p></div>
</form>
</div>
<?php }?>
</div>
</body>
</html>
这个是我的cart.php
<?php
session_start();
if($_SESSION['username']=="")
{
header("location: login.php");
}
if(!empty($_GET["action"])) {
switch($_GET["action"]) {
case "add";
if(!empty($_POST["add"])) {
$productByCode = mysql_query("SELECT * FROM product WHERE p_code='" . $_POST["p_code"] . "'");
$itemArray = array($productByCode["p_code"]=>array('name'=>$productByCode["p_name"], 'code'=>$productByCode["p_code"], 'quantity'=>$_POST["quantity"], 'price'=>$productByCode["p_price"]));
if(!empty($_SESSION["cart_item"])) {
if(in_array($productByCode["p_code"],$_SESSION["cart_item"])) {
foreach($_SESSION["cart_item"] as $k => $v) {
if($productByCode["p_code"] == $k)
$_SESSION["cart_item"][$k]["quantity"] = $_POST["quantity"];
}
} else {
$_SESSION["cart_item"] = array_merge($_SESSION["cart_item"],$itemArray);
}
} else {
$_SESSION["cart_item"] = $itemArray;
}
}
break;
case "remove":
if(!empty($_SESSION["cart_item"])) {
foreach($_SESSION["cart_item"] as $k => $v) {
if($_GET["code"] == $k)
unset($_SESSION["cart_item"][$k]);
if(empty($_SESSION["cart_item"]))
unset($_SESSION["cart_item"]);
}
}
break;
case "empty":
unset($_SESSION["cart_item"]);
break;
}
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
<title>MyCart</title>
<link rel = "stylesheet" href="bootstrap/css/bootstrap.min.css">
<script src="/js/jquery.min.js"></script>
<script src="/js/bootstrap.min.js"></script>
</head>
<style type="text/css">
body
{
background-color: #6BBEE4;
}
</style>
<body>
<nav class="navbar navbar-inverse ">
<div class="container-fluid ">
<div class="navbar-header">
<a class="navbar-brand" href="home.php" >MyComputer</a>
</div>
<div>
<ul class="nav navbar-nav navbar-right">
<li><a href="home.php">Home</a></li>
<li><a href="purchase.php">Purchase</a></li>
<li class="active"><a href="cart.php"><span class="glyphicon glyphicon-shopping-cart"></span> Cart</a></li>
<li><a href="logout.php"><span class="glyphicon glyphicon-log-out"></span> Logout</a></li>
</div>
</div>
</nav>
<div id="shopping-cart">
<div class="txt-heading">Shopping Cart <input class="pull-right" type="button" name="empty" value="Empty Cart"></div>
<?php
if(isset($_SESSION["cart_item"])){
$item_total = 0;
?>
<table class="table table-striped datatable " id="example" border="1" >
<thead align="center">
<tr>
<th class="text-center">Product Name</th>
<th class="text-center">Image</th>
<th class="text-center">Code</th>
<th class="text-center">Description</th>
<th class="text-center">Price</th>
<th class="text-center">Action</th>
</tr>
</thead>
<tbody>
<?php foreach ($_SESSION["cart_item"] as $item){ ?>
<tr>
<td align="center"><?php echo $item['p_name']?></td>
<td align="center"><img src="<?php echo $item['p_image']?>"></td>
<td align="center"><?php echo $item['p_code']?></td>
<td align="center"><?php echo $item['p_desc']?></td>
<td align="center"><?php echo "$" .$item['p_price']?></td>
<td align="center"><input type = "button" class="btn btn-primary" name="remove" value="Remove"></td>
</tr>
<?php
$item_total += ($item['p_price']*$item["quantity"]);
} ?>
<tr>
<td colspan="5" align=right><strong>Total:</strong> <?php echo "$".$item_total; ?></td>
</tr>
</tbody>
</table>
<?php
}
?>
</div>
</head>
</body>
</html>
当我点击“添加到购物车”按钮时，我被重定向到我的cart.php，但项目没有显示。我担心我的购物车会话代码不正确，但我不知道如何解决这个问题
PS让我们暂时忘记SQL注入以及PDO和Mysqli_function。我现在只需要关注mysql_function。谢谢你的理解。
答案 0 :(得分：0)
您需要在使用该会话的所有文件中执行session_start();。将其添加到purchase.php的顶部，或将其放入另一个文件中并在两个文件中都需要它。
purchase.php中的表单已发布到cart.php，因此purchase.php中的此代码将无法运行：
if(!empty($_POST["add"])) {
//code
}