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div id="products-wrapper"
h1Products/h1
div class="products"
?php
//current URL of the Page. cart_update.php redirects back to this URL
$current_url = base64_encode($url="http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
$results = $mysqli-query("SELECT * FROM cart ORDER BY id ASC");
if ($results) {
//fetch results set as object and output HTML
while($obj = $results-fetch_object())
{
echo 'div class="product"';
echo 'form method="post" action="cart_update.php"';
echo 'div class="product-thumb"img src="images/'.$obj-product_img_name.'"/div';
echo 'div class="product-content"h3'.$obj-product_name.'/h3';
echo 'div class="product-desc"'.$obj-product_desc.'/div';
echo 'div class="product-info"';
echo 'Price '.$currency.$obj-price.' | ';
echo 'Qty input type="text" name="product_qty" value="1" size="3" /';
echo 'button class="add_to_cart"Add To Cart/button';
echo '/div/div';
echo 'input type="hidden" name="product_code" value="'.$obj-product_code.'" /';
echo 'input type="hidden" name="type" value="add" /';
echo 'input type="hidden" name="return_url" value="'.$current_url.'" /';
echo '/form';
echo '/div';
}
}
?
/div
div class="shopping-cart"
h2Your Shopping Cart/h2
?php
if(isset($_SESSION["products"]))
{
$total = 0;
echo 'ol';
foreach ($_SESSION["products"] as $cart_itm)
{
echo 'li class="cart-itm"';
echo 'span class="remove-itm"a href="cart_update.php?removep='.$cart_itm["code"].'return_url='.$current_url.'"×/a/span';
echo 'h3'.$cart_itm["name"].'/h3';
echo 'div class="p-code"P code : '.$cart_itm["code"].'/div';
echo 'div class="p-qty"Qty : '.$cart_itm["qty"].'/div';
echo 'div class="p-price"Price :'.$currency.$cart_itm["price"].'/div';
echo '/li';
$subtotal = ($cart_itm["price"]*$cart_itm["qty"]);
$total = ($total + $subtotal);
}
echo '/ol';
echo 'span class="check-out-txt"strongTotal : '.$currency.$total.'/strong a href="view_cart.php"Check-out!/a/span';
echo 'span class="empty-cart"a href="cart_update.php?emptycart=1return_url='.$current_url.'"Empty Cart/a/span';
}else{
echo 'Your Cart is empty';
}
?
/div
cart_update.php
PHP Code
?php
session_start();
include_once("config.php");
//empty cart by distroying current session
if(isset($_GET["emptycart"]) $_GET["emptycart"]==1)
{
$return_url = base64_decode($_GET["return_url"]); //return url
session_destroy();
header('Location:'.$return_url);
}
//add item in shopping cart
if(isset($_POST["type"]) $_POST["type"]=='add')
{
$product_code = filter_var($_POST["product_code"], FILTER_SANITIZE_STRING); //product code
$product_qty = filter_var($_POST["product_qty"], FILTER_SANITIZE_NUMBER_INT); //product code
$return_url = base64_decode($_POST["return_url"]); //return url
//limit quantity for single product
if($product_qty 10){
die('div align="center"This demo does not allowed more than 10 quantity!br /a href=""Back To Products/a./div');
}
//MySqli query - get details of item from db using product code
$results = $mysqli-query("SELECT product_name,price FROM cart WHERE product_code='$product_code' LIMIT 1");
$obj = $results-fetch_object();
if ($results) { //we have the product info
//prepare array for the session variable
$new_product = array(array('name'=$obj-product_name, 'code'=$product_code, 'qty'=$product_qty, 'price'=$obj-price));
if(isset($_SESSION["products"])) //if we have the session
{
$found = false; //set found item to false
foreach ($_SESSION["products"] as $cart_itm) //loop through session array
{
if($cart_itm["code"] == $product_code){ //the item exist in array
$product[] = array('name'=$cart_itm["name"], 'code'=$cart_itm["code"], 'qty'=$product_qty, 'price'=$cart_itm["price"]);
$found = true;
}else{
//item doesn't exist in the list, just retrive old info and prepare array for session var
$product[] = array('name'=$cart_itm["name"], 'code'=$cart_itm["code"], 'qty'=$cart_itm["qty"], 'price'=$cart_itm["price"]);
}
}
if($found == false) //we didn't find item in array
{
//add new user item in array
$_SESSION["products"] = array_merge($product, $new_product);
}else{
//found user item in array list, and increased the quantity
$_SESSION["products"] = $product;
}
}else{
//create a new session var if does not exist
$_SESSION["products"] = $new_product;
}
}
//redirect back to original page
header('Location:'.$return_url);
}
//remove item from shopping cart
if(isset($_GET["removep"]) isset($_GET["return_url"]) isset($_SESSION["products"]))
{
$product_code = $_GET["removep"]; //get the product code to remove
$return_url = base64_decode($_GET["return_url"]); //get return url
foreach ($_SESSION["products"] as $cart_itm) //loop through session array var
{
if($cart_itm["code"]!=$product_code){ //item does,t exist in the list
$product[] = array('name'=$cart_itm["name"], 'code'=$cart_itm["code"], 'qty'=$cart_itm["qty"], 'price'=$cart_itm["price"]);
}
//create a new product list for cart
$_SESSION["products"] = $product;
}
//redirect back to original page
header('Location:'.$return_url);
}
?
view_cart.php
PHP Code
div class="view-cart"
?php
$current_url = base64_encode($url="http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
if(isset($_SESSION["products"]))
{
$total = 0;
echo 'form method="post" action="paypal-express-checkout/process.php"';
echo 'ul';
$cart_items = 0;
foreach ($_SESSION["products"] as $cart_itm)
{
$product_code = $cart_itm["code"];
$results = $mysqli-query("SELECT product_name,product_desc, price FROM cart WHERE product_code='$product_code' LIMIT 1");
$obj = $results-fetch_object();
echo 'li class="cart-itm"';
echo 'span class="remove-itm"a href="cart_update.php?removep='.$cart_itm["code"].'return_url='.$current_url.'"×/a/span';
echo 'div class="p-price"'.$currency.$obj-price.'/div';
echo 'div class="product-info"';
echo 'h3'.$obj-product_name.' (Code :'.$product_code.')/h3 ';
echo 'div class="p-qty"Qty : '.$cart_itm["qty"].'/div';
echo 'div'.$obj-product_desc.'/div';
echo '/div';
echo '/li';
$subtotal = ($cart_itm["price"]*$cart_itm["qty"]);
$total = ($total + $subtotal);
echo 'input type="hidden" name="item_name['.$cart_items.']" value="'.$obj-product_name.'" /';
echo 'input type="hidden" name="item_code['.$cart_items.']" value="'.$product_code.'" /';
echo 'input type="hidden" name="item_desc['.$cart_items.']" value="'.$obj-product_desc.'" /';
echo 'input type="hidden" name="item_qty['.$cart_items.']" value="'.$cart_itm["qty"].'" /';
$cart_items ++;
}
echo '/ul';
echo 'span class="check-out-txt"';
echo 'strongTotal : '.$currency.$total.'/strong ';
echo '/span';
echo '/form';
}else{
echo 'Your Cart is empty';
}
?
/div
/div
数据库是建立一个购物车的表的。用户ID作外链。用户选定一种商品，存商品相关属性入表。用户查看购物车时只要把有该用户ID的购物信息读出来就行了。维护这张表就可以体现出用户的购物行为了。
在数据库里面用表（ShopingCart）
表有几个基本字段
CartId 购物车ID（唯一）
Id 商品的ID（唯一）
Qty 用户购买商品的数量
CreateDate 购物车创建时间
此表的字段CartId是区分不同用户的购物车的ID，要是登陆用户，你可以在表中存放此登陆用户的登陆名的ID，要是未登陆用户使用购物车，
如果是非登陆用户
购物车
有两种实现方式，一种是保存在数据库，另外一种是session
保存在数据库的不会以为关闭浏览器而消失，session会因为关闭浏览器就没有了。
原理是把每个商品的信息存到一个数组里面，然后以这个商品的id作为键值，然后吧数组存到session里面就行，
如果是存入数据库的话，就用关联数据存一下就行的
用户登陆后系统应该会分配一个session ： id，这个id应该是改用于的用户表id。然后再做一个购物车的表，里面可以只考虑存商品id、用户id等关键信息；
当用户提交购买的时候再做相关的操作，具体可以参考淘宝、天猫的购物车已经后续付款效果。
我来解答一下你的疑惑
买了两个产品。那就是执行了两次
insert
into
temp_table
(uid,productid,pnum,poneprice,ptotalprice)
如果
productid相同则，
pnum
=
pnum+1;
ptotalprice
=
pnum*poneprice
假设前提是
当前两条记录的产品不同，那么购物车列表则是循环读取temp_table列出现有符合条件之产品，数量，价格。
修改2个产品数量的时候，
提交后，同样的文本框pnum为一个数组，productid为一个数组
获取pnum,productid,并且用
split分析后，
分别update
update
temp_table
set
pnum='".$pnum[0]."',ptotalprice='..省略.'
where
uid=自己的uid
and
productid='".$productid[0]."'
注意，这里数组下标要对应好，你可以用个循环。
最后，当订单下好之后，要把临时表的数据转移到正式表中，并且清理掉当前这个用户临时表的内容即可。