OO Shopping Cart Serialization

wheezy360 · #1 (**permalink**) 12-13-03, 01:40 PM

Having troubles with (un)serialization of my cart object.. The data does transfer ok, but it doesn't come out on the other side as being an object of type Cart.. It's possibly due to the fact that I don't have any __sleep() or __wakeup() functions, but I was hoping I wouldn't need to as it's really just an array with functions.

http://www.proteus3d.net/ps2/test_cart.php

Code:

<?
session_start();
include("cart.php");

$cart = new Cart();
$cart->add_item("1234567890", 2);
$cart->add_item("0987654321", 1);
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Testing Cart</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
</head>

<body>
Cart contents:<br />
<?
$cart_array = $cart->get_items();
if (!$cart_array) {
	exit;
}
print_r($cart_array);
echo "<br />";
echo $cart->get_count();
foreach($cart_array as $sku => $qty)
{
	echo "$sku<br />";
}
session_register("cart");
?>
<br />
<a href="test_cart2.php">Test Cart 2</a>
</body>
</html>

http://www.proteus3d.net/ps2/test_cart2.php

Code:

<?
session_start();
include("cart.php");
if(!session_is_registered("cart")){
	exit;
}

$cart = $_SESSION["cart"];

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Testing Cart 2</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
</head>

<body>
Retrieving session cart:<br />
<?
print_r($cart);
echo "<br /><br />";
//print_r($cart->get_items());
?>
</body>
</html>

Cart Class Definition

Code:

class Cart
{
	var $items; 
	

	function Cart($arr = false)
	{
		if(!$arr)
			$this->items = array();
		else
			$this->items = $arr;
	}

	function add_item($sku, $qty)
	{
		$this->items[$sku] += $qty;
	}

	function remove_item($sku, $qty)
	{
		if ($this->items[$sku] > $qty)
		{
			$this->items[$sku] -= $qty;
			return true;
		}
		else
		{
			return false;
		}   
	}
	
	function get_items()
	{
		if(count($this->items) > 0)
			return $this->items;
		else
			return false;
	}

	function get_count()
	{
	                return count($this->items);
	}
	

}
?>

The error I get:

Quote:

Retrieving session cart:
__PHP_Incomplete_Class Object ( [__PHP_Incomplete_Class_Name] => cart [items] => Array ( [1234567890] => 2 [0987654321] => 1 ) )

As you can see, the data does travel through, but I get this __PHP_Incomplete_Class Object stuff.. Any ideas??

sancho · #2 (**permalink**) 12-29-03, 09:09 PM

You have to define the cart class before you run session_start. You can simply include ("cart.php") before calling session_start() function. If you do so, all objects will be unserialized sucessfully.

Quote:

Originally Posted by wheezy360

Having troubles with (un)serialization of my cart object.. The data does transfer ok, but it doesn't come out on the other side as being an object of type Cart.. It's possibly due to the fact that I don't have any __sleep() or __wakeup() functions, but I was hoping I wouldn't need to as it's really just an array with functions.

http://www.proteus3d.net/ps2/test_cart.php
[code]
<?
session_start();
include("cart.php");
....