This is in Chapter 10:

I get:

Fatal error: Call to a member function getPrice() on a non-object in C:\usr\web\shopping_cart.php on line 92:

<?php
$totalPrice = 0;
foreach ( $_SESSION["cart"] as $product ) {
$totalPrice += $product->getPrice();

$product is the non-object.

The error tells you that your $_SESSION["cart"] is empty/NULL and $product is also empty/NULL.

Post all the code here using inside [PHP] tags. And describe step by step how you end up with error.