basket problem

[jansky]

to all guru

this script is for shopping cart and still got some bugs, The basket is a class

HERE IS The error i got

Notice: Undefined variable: basket in c:\inetpub\wwwroot\cart\insertsample.php on line 18
Fatal error: Call to a member function on a non-object in c:\inetpub\wwwroot\cart\insertsample.php on line 22

here is the full source code

cart_class.php

<?
class Basket {
        var $basket_count;
        var $basket_item_id;

	var $basket_item_album;
	var $basket_item_img;
    var $basket_item_shortdesc;
    var $basket_item_quantity;
    var $basket_item_price;

    function Basket() {
            $this->basket_count=0;
    }
    function Add_Item($id,$img,$shortdesc,$quantity=1,$price=0) {
            $this->basket_item_id[$this->basket_count]=$id;
//				$this->basket_item_artist[$this->basket_count]=$artist;
				$this->basket_item_album[$this->basket_count]=$album;
				$this->basket_item_img[$this->basket_count]=$img;
                $this->basket_item_shortdesc[$this->basket_count]=$shortdesc;				
                $this->basket_item_quantity[$this->basket_count]=$quantity=1;
                $this->basket_item_price[$this->basket_count]=$price;
                //$this->basket_item_wt[$this->basket_count]=$wt;

            $this->basket_count++;
            return ($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_artist($pos) {
                return $this->basket_item_artist[$pos];
        } */
		function Get_Item_album($pos) {
                return $this->basket_item_album[$pos];
        }
		function Get_Item_img($pos) {
                return $this->basket_item_img[$pos];
        }
        function Get_Item_shortdesc($pos) {
                return $this->basket_item_shortdesc[$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_wt($pos) {
 //               return $this->basket_item_wt[$pos];
  //      }
        function Set_Item_Quantity($pos,$quantity) {
                $this->basket_item_quantity[$pos]=$quantity;
        }
        function Enum_Items($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;
        }
}
?>

NOW TO add product on cart

add.php

<?
require("cart_class.php");
session_name("mysession");
session_start();
if (!session_is_registered("basket")) {
	$basket=new Basket;
	session_register("basket");
}

$myid="";
$myquant="";
$zpos="";
$itemid=@$_GET["itemid"];

  if ($basket->Get_Basket_Count()>0) {  # are there items in the basket
	$pos = $basket->Enum_Items(true);
	while ($pos>=0) {

       if ($basket->Get_Item_id($pos)==$itemid)
          {
          $basket->Set_Item_Quantity($pos,($basket->Get_Item_quantity($pos)+1));
          $addprod="no";
          }

       $myid=$basket->Get_Item_id($pos);
       $myquant=$basket->Get_Item_quantity($pos);
       $zpos=$pos;

       $pos = $basket->Enum_Items();
              }
} 


if (@$addprod!="no")
{
  // please modify the query here to get the result 
	/*
	$SQL = "select recordid,album,thumbnail,shortdesc,price from tblproducts WHERE recordid='$itemid'";
	$result = mysql_query($SQL) or die("Invalid query: " . mysql_error());
	$row = mysql_fetch_object($result);
	*/

 // to add item on basket this is the original since data coming from your table
//$basket->Add_Item($itemid,$row->album,$row->thumbnail,$row->shortdesc,$row->qty,$row->price);

// end  of original code
// since  i dont have any idea on your products so i put dummy data in this cart

$basket->Add_Item($itemid,"this is image","This is a short description",1,1.55);	





}
echo "<script>location.replace('insertsample.php');</script>";
//header("Location:insertsample.php");
?>

AND i created a sample page

insertsample.php

<?
require("cart_class.php");
session_name("mysession");
session_start();
if (!session_is_registered("basket")) 
{
	$basket=new Basket;
	session_register("basket");
}
?>
<html>
<head>
<title>Sample page to insert products</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>

<body>
<?  echo $basket->basket_count;?>
<A href="add.php?itemid=1">Item 1</A><br>
<A href="add.php?itemid=2">Item 2</A><br>
<? 
	$basket->Add_Item(1,"this is image","This is a short description",1,1.55);	
?>

</body>
</html>

[Weedpacket]

One thing: why are you still using session_register() and session_is_registered()? $_SESSION has been around for four years, now.