我有一个订购页面，让用户在其中订购，并将其添加到购物车中。然后在购物车页面中，我显示订单，用户可以更改订单。我想做的是将这个购物车信息保存到数据库中，这样我就可以实现一个签出，也可以将购物车内容插入到数据库中。我在网上找过，但没有找到任何解决方案。以下是我的代码-index.php
<?php
session_start();
require("connection.php");
if(isset($_GET['page'])){
$pages=array("products", "cart");
if(in_array($_GET['page'], $pages)) {
$_page=$_GET['page'];
}else{
$_page="products";
}
}else{
$_page="products";
}
?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- <link rel="stylesheet" href="css/reset.css" /> -->
<link rel="stylesheet" href="styles.css" />
<title>HackLunch</title>
</head>
<body>
<h1> Welcome to our site </h1>
<div id="container">
<div id="main">
<?php require($_page.".php"); ?>
</div><!--end of main-->
<div id="sidebar">
<h1>Cart</h1>
<?php
if(isset($_SESSION['cart'])){
$sql="SELECT * FROM products WHERE id_product IN (";
foreach($_SESSION['cart'] as $id => $value) {
$sql.=$id.",";
}
$sql=substr($sql, 0, -1).") ORDER BY name ASC";
$query=mysql_query($sql);
while($row=mysql_fetch_array($query)){
?>
<p><?php echo $row['name'] ?> x <?php echo $_SESSION['cart'][$row['id_product']]['quantity'] ?></p>
<?php
}
?>
<hr />
<a href="index.php?page=cart">Go to cart</a>
<?php
}else{
echo "<p>Your Cart is empty. Please add some products.</p>";
}
?>
</div><!--end of sidebar-->
</div><!--end container-->
</body>
</html>
cart.php
<?php
if(isset($_POST['submit'])){
foreach($_POST['quantity'] as $key => $val) {
if($val==0) {
unset($_SESSION['cart'][$key]);
}else{
$_SESSION['cart'][$key]['quantity']=$val;
}
}
}
?>
<h1>View cart</h1>
<a href="index.php?page=products">Go back to the products page.</a>
<form method="post" action="index.php?page=cart">
<table>
<tr>
<th>Name</th>
<th>Quantity</th>
<th>Price</th>
<th>Items Price</th>
</tr>
<?php
$sql="SELECT * FROM products WHERE id_product IN (";
foreach($_SESSION['cart'] as $id => $value) {
$sql.=$id.",";
}
$sql=substr($sql, 0, -1).") ORDER BY name ASC";
$query=mysql_query($sql);
$totalprice=0;
while($row=mysql_fetch_array($query)){
$subtotal=$_SESSION['cart'][$row['id_product']]['quantity']*$row['price'];
$totalprice+=$subtotal;
?>
<tr>
<td><?php echo $row['name'] ?></td>
<td><input type="text" name="quantity[<?php echo $row['id_product'] ?>]" size="5" value="<?php echo $_SESSION['cart'][$row['id_product']]['quantity'] ?>" /></td>
<td><?php echo $row['price'] ?>$</td>
<td><?php echo $_SESSION['cart'][$row['id_product']]['quantity']*$row['price'] ?>$</td>
</tr>
<?php
}
?>
<tr>
<td colspan="4">Total Price: <?php echo $totalprice ?></td>
</tr>
</table>
<br />
<button type="submit" name="submit">Update Cart</button>
<a href="checkout.php">Checkout</a>
</form>
<br />
<p>To remove an item set its quantity to 0. </p>
products.php
<?php
if(isset($_GET['action']) && $_GET['action']=="add"){
$id=intval($_GET['id']);
if(isset($_SESSION['cart'][$id])){
$_SESSION['cart'][$id]['quantity']++;
}else{
$sql_s="SELECT * FROM products
WHERE id_product={$id}";
$query_s=mysql_query($sql_s);
if(mysql_num_rows($query_s)!=0){
$row_s=mysql_fetch_array($query_s);
$_SESSION['cart'][$row_s['id_product']]=array(
"quantity" => 1,
"price" => $row_s['price']
);
}else{
$message="This product id it's invalid!";
}
}
}
?>
<h1>Product List</h1>
<?php
if(isset($message)){
echo "<h2>$message</h2>";
}
?>
<table>
<tr>
<th>Name</th>
<th>Price</th>
<th>Action</th>
</tr>
<?php
$sql="SELECT * FROM products ORDER BY name ASC";
$query=mysql_query($sql);
while ($row=mysql_fetch_array($query)) {
?>
<tr>
<td><?php echo $row['name'] ?></td>
<td><?php echo $row['price'] ?>$</td>
<td><a href="index.php?page=products&action=add&id=<?php echo $row['id_product'] ?>">Add to cart</a></td>
</tr>
<?php
}
?>
</table>
我试过像这样实现我的checkout.php，但它不起作用。
<?php
include("connection.php");
$serialized_cart = serialize($_SESSION["cart"]);
$sql = "INSERT INTO cart (contents) VALUES ('" . mysql_real_escape_string($serialized_cart) . "')";
mysql_query($sql)
or die("Query to store cart failed");
?>
如果你插入ROWS而不是串行数据，你可能会做得更好。（你知道，这有点难看。）
像你已经做的那样迭代你的行：
$sql="SELECT * FROM products WHERE id_product IN (";
foreach($_SESSION['cart'] as $id => $value) {
$sql.=$id.",";
//execute an insert here..
}
并花一些时间学习php-PDO。你可能不会后悔，也不会受到太多的抨击。