一个比较完善的购物车类_PHP
前不久做到一个项目需要用到购物车,考虑到可能经常用到,所以把它封装成一个类,以便以后调用。你可以简单的把这个类稍微修改一下就可以用在自己的程序里了,具体使用请见。
/*****************************************************************************/
/* */
/* file type: 包含文件,建议后缀为.inc */
/* */
/* file name: cart.inc */
/* */
/* Description: 定义一个购车类 */
/* */
/* Func list : class cart */
/* */
/* author : bigeagle */
/* */
/* date : 2000/12/24 */
/* */
/* History: 2000/12/24 finished */
/* */
/*****************************************************************************/
//定义本文件常量
define("_CART_INC_" , "exists") ;
/*购物车类*/
class TCart
{
var $SortCount; //商品种类数
var $TotalCost; //商品总价值
var $Id; //每类商品的ID(数组)
var $Name; //每类商品的名称(数组)
var $Price; //每类商品的价格(数组)
var $Discount; //商品的折扣(数组)
var $GoodPrice ; //商品的优惠价格(数组)
var $Count; //每类商品的件数(数组)
var $MaxCount ; //商品限量(数组)
//******构造函数
function TCart()
{
$this->SortCount=0;
session_start(); //初始化一个session
session_register('sId');
session_register('sName');
session_register('sPrice');
session_register('sDiscount');
session_register('sGoodPrice') ;
session_register('sCount') ;
session_register('sMaxCount') ;
$this->Update();
$this->Calculate();
}
//********私有,根据session的值更新类中相应数据
function Update()
{
global $sId,$sName,$sPrice,$sCount,$sDiscount,$sMaxCount,$sGoodPrice;
if(!isset($sId) or !isset($sName) or !isset($sPrice)
or !isset($sDiscount) or !isset($sMaxCount)
or !isset($sGoodPrice) or !isset($sCount)) return;
$this->Id =$sId;
$this->Name =$sName;
$this->Price =$sPrice;
$this->Count =$sCount;
$this->Discount = $sDiscount ;
$this->GoodPrice = $sGoodPrice ;
$this->MaxCount = $sMaxCount ;
//计算商品总数
$this->SortCount=count($sId);
}
//********私有,根据新的数据计算每类商品的价值及全部商品的总价
function Calculate()
{
for($i=0;$iSortCount;$i++)
{
/*计算每件商品的价值,如果折扣是0 ,则为优惠价格*/
$GiftPrice = ($this->Discount[$i] == 0 ? $this->GoodPrice :
ceil($this->Price[$i] * $this->Discount[$i])/100 );
$this->TotalCost += $GiftPrice * $this->Count[$i] ;
}
}
//**************以下为接口函数
//*** 加一件商品
// 判断是否蓝中已有,如有,加count,否则加一个新商品
//首先都是改session的值,然后再调用update() and calculate()来更新成员变量
function Add($a_ID , $a_Name , $a_Price , $a_Discount ,
$a_GoodPrice , $a_MaxCount , $a_Count)
{
global $sId , $sName , $sCount , $sPrice , $sDiscount ,
$sGoodPrice , $sMaxCount ;
$k=count($sId);
for ($i=0; $i{ //先找一下是否已经加入了这种商品
if($sId[$i]==$a_ID)
{
$sCount[$i] += $a_Count ;
break;
}
}
if($i >= $k)
{ //没有则加一个新商品种类
$sId[] = $a_ID;
$sName[] = $a_Name;
$sPrice[] = $a_Price;
$sCount[] = $a_Count;
$sGoodPrice[] = $a_GoodPrice ;
$sDiscount[] = $a_Discount ;
$sMaxCount[] = $a_MaxCount ;
}
$this->Update(); //更新一下类的成员数据
$this->Calculate();
}
//移去一件商品
function Remove($a_ID)
{
global $sId , $sName , $sCount , $sPrice , $sDiscount ,
$sGoodPrice , $sMaxCount ;
$k = count($sId);
for($i=0; $i {
if($sId[$i] == $a_ID)
{
$sCount[$i] = 0 ;
break;
}
}
$this->Update();
$this->Calculate();
}
//改变商品的个数
function ModifyCount($a_i,$a_Count)
{
global $sCount;
$sCount[$a_i] = $a_Count ;
$this->Update();
$this->Calculate();
}
/***************************
清空所有的商品
*****************************/
function RemoveAll()
{
session_unregister('sId');
session_unregister('sName');
session_unregister('sPrice');
session_unregister('sDiscount');
session_unregister('sGoodPrice') ;
session_unregister('sCount') ;
session_unregister('sMaxCount') ;
$this->SortCount = 0 ;
$this->TotalCost = 0 ;
}
//是否某件商品已在蓝内,参数为此商品的ID
function Exists($a_ID)
{
for($i=0; $iSortCount; $i++)
{
if($this->Id[$i]==$a_ID) return TRUE;
}
return FALSE;
}
//某件商品在蓝内的位置
function IndexOf($a_ID)
{
for($i=0; $iSortCount; $i++)
{
if($this->Id[$i]==$id) return $i;
}
return 0;
}
//取一件商品的信息,主要的工作函数
//返回一个关联数组,
function Item($i)
{
$Result[id] = $this->Id[$i];
$Result[name] = $this->Name[$i];
$Result[price] = $this->Price[$i];
$Result[count] = $this->Count[$i];
$Result[discount] = $this->Discount[$i] ;
$Result[goodprice] = $this->GoodPrice[$i] ;
$Result[maxcount] = $this->MaxCount[i] ;
return $Result;
}
//取总的商品种类数
function CartCount()
{
return $this->SortCount;
}
//取总的商品价值
function GetTotalCost()
{
return $this->TotalCost;
}
}

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