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注册 2004-2-15
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[推荐阅读] 我也要吃
我也发一个吧，简单点的
好多天没出门了，吃不到绿色食品，眼睛倒是快绿了^_^
<?php
/**
* 类名: cart
* 描述: 购物车
* 其他: 2004-8-19
*/
class cart
{
/**
* 物品
*/
var $item;
/**
* 总数
*/
var $total;
/**
* 构造函数，初始化购物车
*/
function cart()
{
$this->item = array();
$this->total = 0;
}
/**
* 添加商品入购物车
*
* @param int $id 商品ID
* @param int $num 商品数量
* @param float $price 商品单价
*/
function addItem($id, $num, $price)
{
// 如果商品存在就加数量和价格,否则直接加入
if(!isset($this->item[$id]))
{
$this->item[$id]["num"] = (int)$num;
$total_cost = $this->item[$id]["cost"] = (float)$price * (int)$num;
$this->total += $total_cost;
}
else
{
$item_count = $this->item[$id]["num"] += (int)$num;
$this->item[$id]["cost"] += (float)$price * (int)$item_count;
$new_cost = (int)$num * $item_price;
$this->total += $new_cost;
}
}
/**
* 修改商品数量
*
* @param int $id 商品ID
* @param int $num 商品数量
* @param float $price 商品单价
*/
function modItem($id, $num, $price)
{
$pre_num = $this->item[$id]['num'];
$cur_num = $pre_num - $num;
$this->item[$id]['cost'] = $num * $price;
$this->item[$id]['num'] = $num;
$this->total -= $cur_num * $price;
}
/**
* 取得总价
*/
function getTotalCost()
{
Return $this->total;
}
/**
* 取得物品总数
*/
function getItemNum()
{
$total = 0;
foreach($this->item as $key=>$val)
{
if(isset($val['num']))
{
$total += $val['num'];
}
}
Return $total;
}
/**
* 删除商品
*
* @param int $id 商品ID
*/
function delItem($id)
{
$this->total -= $this->item[$id]['cost'];
$this->item[$id] = array();
}
/**
* 清空购物车
*/
function clear()
{
$this->item = array();
$this->total = 0;
}
}
// 测试
session_start();
if(!isset($CartHandler))
{
$CartHandler = new cart;
$_SESSION['cart'] = $CartHandler;
}
$CartHandler->addItem(1,3,5);
$CartHandler->addItem(2,2,4.5);
echo "修改前总数:".$CartHandler->getItemNum()."<br>";
echo "修改前总价:".$CartHandler->getTotalCost()."<br>";
$CartHandler->modItem(1,2,5);
echo "修改后总数:".$CartHandler->getItemNum()."<br>";
echo "修改后总价:".$CartHandler->getTotalCost()."<br>";
$CartHandler->delItem(1);
echo "删除后总数:".$CartHandler->getItemNum()."<br>";
echo "删除后总价:".$CartHandler->getTotalCost()."<br>";
?>
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