我创建了一个非常基本的电子商务应用程序，这是购物车的完整代码。我在获取更新购物车的功能时遇到问题，(例如，我将 1 个产品添加到购物车中，然后进入购物车并希望将订购数量更改为 10，代码目前不允许我)并且要清除字段，我有代码，但它什么也没做。谢谢
<?
include("includes/db.php");
include("includes/functions.php");
if($_REQUEST['command']=='delete' && $_REQUEST['pid']>0){
remove_product($_REQUEST['pid']);
}
else if($_REQUEST['command']=='clear'){
unset($_SESSION['cart']);
}
else if($_REQUEST['command']=='update'){
$max=count($_SESSION['cart']);
for($i=0;$i<$max;$i++){
$pid=$_SESSION['cart'][$i]['productid'];
$q=intval($_REQUEST['product'.$pid]);
if($q>0 && $q<=999){
$_SESSION['cart'][$i]['qty']=$q;
}
else{
$msg='Some proudcts not updated!, quantity must be a number between 1 and 999';
}
}
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Shopping Cart</title>
<script language="javascript">
function del(pid){
if(confirm('Do you really mean to delete this item?')){
document.form1.pid.value=pid;
document.form1.command.value='delete';
document.form1.submit();
}
}
function clear_cart(){
if(confirm('This will empty your shopping cart, continue?')){
document.form1.command.value='clear';
document.form1.submit();
}
}
function update_cart(){
document.form1.command.value='update';
document.form1.submit();
}
<div id="login">
<?php
session_start();
// dBase file
include "dbConfig.php";
if ($_GET["op"] == "login")
{
if (!$_POST["username"] || !$_POST["password"])
{
die("You need to provide a username and password.");
}
// Create query
$q = "SELECT * FROM `dbUsers` "
."WHERE `username`='".$_POST["username"]."' "
."AND `password`=PASSWORD('".$_POST["password"]."') "
."LIMIT 1";
// Run mysql query
$r = mysql_query($q);
if ( $obj = @mysql_fetch_object($r) )
{
// Login good, create session variables
$_SESSION["valid_id"] = $obj->id;
$_SESSION["valid_user"] = $_POST["username"];
$_SESSION["valid_time"] = time();
// Redirect to member page
Header("Location: index.php?p=members");
}
else
{
// Login not successful
die("Sorry, could not log you in. Wrong login information.");
}
}
else
{
//If all went right the Web form appears and users can log in
echo "<form action=\"?p=login&op=login\" method=\"POST\">";
echo "Username: <input name=\"username\" size=\"20\"><br />";
echo "Password: <input type=\"password\" name=\"password\" size=\"20\"><br />";
echo "<input type=\"submit\" value=\"Login\">";
echo "</form>";
}
?>
<li><a href="index.php?p=register">Register</a></li></div>
</ul>
</div>
</script>
</head>
<body>
<form name="form1" method="post">
<input type="hidden" name="pid" />
<input type="hidden" name="command" />
<div style="margin:0px auto; width:550px;" >
<div style="padding-bottom:10px">
<div style="padding-top:50px">
<h1 align="center">Shopping Basket</h1>
<input type="button" value="Continue Shopping" onclick="window.location='index.php?p=products'" />
</div>
<div style="color:#F00"><?=$msg?></div>
<table border="0" cellpadding="5px" cellspacing="1px" style="font-family:Verdana, Geneva, sans-serif; font-size:12px; background-color:#E1E1E1" width="100%">
<?
if(is_array($_SESSION['cart'])){
echo '<tr bgcolor="#FFFFFF" style="font-weight:bold"><td>Serial</td><td>Name</td><td>Price</td><td>Qty</td><td>Amount</td><td>Options</td></tr>';
$max=count($_SESSION['cart']);
for($i=0;$i<$max;$i++){
$pid=$_SESSION['cart'][$i]['productid'];
$q=$_SESSION['cart'][$i]['qty'];
$pname=get_product_name($pid);
if($q==0) continue;
?>
<tr bgcolor="#FFFFFF"><td><?=$i+1?></td><td><?=$pname?></td>
<td>£ <?=get_price($pid)?></td>
<td><input type="text" name="product<?=$pid?>" value="<?=$q?>" maxlength="3" size="2" /></td>
<td>£ <?=get_price($pid)*$q?></td>
<td><a href="javascript:del(<?=$pid?>)">Remove</a></td></tr>
<?
}
?>
<tr><td><b>Order Total + Shipping: £<?=get_order_total() +5.00?></b></td><td colspan="5" align="right"><input type="button" value="Clear Cart" onclick="clear_cart()"><input type="button" value="Update Cart" onclick="update_cart()"><input type="button" value="Place Order" onclick="window.location='index.php?p=billing'"></td></tr>
<?
}
else{
echo "<tr bgColor='#FFFFFF'><td>There are no items in your shopping cart!</td>";
}
?>
</table>
</div>
</form>
</body>
</html>
最佳答案
我非常确定，如果您想使用 $_SESSION 变量，则需要将 session_start() 移至代码顶部。
关于php - 购物车功能、更新和清除字段，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9889844/