Storing an array of objects in a session

[jbraxx]

Hey everyone,

I'm trying to create a script that will add an object to an array, which will then be stored in a session. I'd like to then access the object's properties from that stored array.

Here's the relevant part of my object class:

class Cart {
    var $total = 0;
    var $itemcount = 0;
    var $items = array();
    var $itemqtys = array();

public function add_item($item_id, $qty=1) {

    if(isset($this->itemqtys[$item_id]) && $this->itemqtys[$item_id] > 0) {
        // item in cart already
        $this->itemqtys[$item_id] = $qty + $this->itemqtys[$item_id];
        $this->update_total();
    } else {
        ${$item_id} = Item::find_by_id($item_id);
        $this->items[]= ${$item_id};
        $this->itemqtys[$item_id] = $qty;
    }
    $this->update_total();
}

function update_total() {
    $this->itemcount = 0;
    $this->total = 0;
    if(count($this->items > 0)) {
        foreach($this->items as $item) {
            $this->total = $this->total + ($this->itemprices[$item] * $this->itemqtys[$item]);
            $this->itemcount++;
        }
    }
}

...
So I've got an array defined, and the add_item function should create an instance of the Item object using find_by_id and then store it in the items array. (find_by_id works - it finds the item in the database, instantiates it, and assigns it's properties)

The class file gets included, then the cart is instantiated and the add_item function called:

$cart =& $_SESSION['cart'];
    if(!is_object($cart)) {
        $cart = new Cart();
    }
    if(isset($_GET['insert_id'])) {
        $id = $_GET['insert_id'];
        $cart->add_item($id);
    }

...

Then I try to echo stored objects' title:

foreach($cart->items as $item) {
     echo $item->title;
}

...

There is some html surrounding that of course. But what I get back is "Notice: trying to get property of non-object..." Any idea what needs to change?

Thanks!

[Weedpacket]

I note a parenthesis is misplaced on this line:

        if(count($this->items > 0)) { 

That'll need to change even if it isn't the cause of your immediate problem.

In respect of which I ask: is the car going into the session? As well as using var_dump() to check what exactly $cart contains immediately after you get it from the session array, you might want to check the session data itself to see if it's in there (if you're using the default session handling mechanism - and if you don't know what I mean then you are! - there'd be a file in your temp directory named after the session ID). There should be a section that starts [font=monospace]cart|0:4:"Cart":[/font]....