question about in_cart() function,

[tcarden]

I'm trying to trouble shoot some code in my new observer class. this is my first time out using the observer class and i've gone thru the 2 tuts in the wiki.

i'm trying to check for the presence of certain products (hazmat) in the cart. and if there, create a

$_SESSION['hazMatOneInCart'] = TRUE 

var.

orig i have a var based on a specific product id -
var $hazMatProdOne = 115;

and then ran like below -

function update(&$class, $eventID, $paramsArray = array()) {
     if($_SESSION['cart']->in_cart($this->hazMatProdOne)) {
        //echo 'has HazMat One';
        $_SESSION['hazMatOneInCart'] = TRUE;
    } 
} 

didn't seem to be working, and then, for testing purposes when i switched out the var $hazMatProdOne to an integer, 115 (a product id) and got an error -

function update(&$class, $eventID, $paramsArray = array()) {
     if($_SESSION['cart']->in_cart($this->115)) {
        $_SESSION['hazMatOneInCart'] = TRUE;
    } 
    
}