class Basket {
        var $basket_count;
        var $basket_item_id;
        var $basket_item_name;
        var $basket_item_quantity;
        var $basket_item_data;
        var $basket_item_price;

        function Basket() {
                $this->basket_count=0;
        }
        function Add_Item($ID,$name,$quantity=1,$price=0,$data='') {
                $this->basket_item_id[$this->basket_count]=$ID;
                $this->basket_item_name[$this->basket_count]=$name;
                $this->basket_item_quantity[$this->basket_count]=$quantity;
                $this->basket_item_data[$this->basket_count]=$data;
                $this->basket_item_price[$this->basket_count]=$price;
                $this->basket_count++;
                return ($this->basket_count-1);
        }
        function Del_Item($pos) {
                $this->basket_item_id[$pos]='';
        }
        function Get_Item_ID($pos) {
                return $this->basket_item_id[$pos];
        }
        function Get_Item_Name($pos) {
                return $this->basket_item_name[$pos];
        }
        function Get_Item_Price($pos) {
                return $this->basket_item_price[$pos];
        }
        function Get_Item_Quantity($pos) {
                return $this->basket_item_quantity[$pos];
        }
        function Get_Item_Data($pos) {
                return $this->basket_item_data[$pos];
        }
        function Set_Item_Quantity($pos,$quantity) {
                $this->basket_item_quantity[$pos]=$quantity;
        }
        function Set_Item_Data($pos,$data) {
                $this->basket_item_data[$pos]=$data;
        }
        function Enum_Items($start=false) {
                static $current;
                if ($current>=$this->basket_count) return -1;
                if (!$start) {
                        $current++;
                } else {
                        $current=0;
                }
                while (($this->basket_item_id[$current]=='') && ($current<$this->basket_count)) {
                        $current++;
                }
                return ($current<$this->basket_count) ? $current : -1;
        }
        function Empty_Basket() {
                $this->basket_count=0;
        }
        function Get_Basket_Count() {
            $num=0;
            for ($i=0;$i<$this->basket_count;$i++) {
                        if ($this->basket_item_id[$i]!='') $num++;
            }
            return $num;
        }
}
?>




session类中的一些方法使用：
  注册一个session类
  ---------------------------------------
    session_start();
   if (! ssession_is_registered("basket") ) {
	$basket=new Basket;
	session_register("basket");
    }

   ---------------------------------------

  添加一件商品
  -----------------------------------------------------------------
 $basket->Add_Item($ITEM_ID,$DISPLAY_NAME,$quantity,$price,$data);
  ------------------------------------------------------------------
 

  Del_* Get_* Set_*  删除商品 \ 得到商品值 \ 设置数量 (这只是几个例子,更多方法可以看类文件)
 ------------------------------------------------------------------- 
  $basket->Del_Item(0)  
  $basket->Get_Item_Data(0) 
  $basket->Set_Item_Quantity(0,0)
 -------------------------------------------------------------------


  得到购物车所有的商品
  -----------------------------------------------------------------------------

  if ($basket->Get_Basket_Count()>0) {  
	$pos = $basket->Enum_Items(true);
	while ($pos>=0) {
		print $basket->Get_Item_Name($pos)."-".$basket->Get_Item_Quantity($pos)."<BR>";
		$pos = $basket->Enum_Items();
	   }
      }  
  -------------------------------------------------------------------------------------------------- 
 
   清空购物车
 -----------------------------
  $basket-> Empty_Basket();
 -----------------------------