When I use the cart for the photobooks for eg "?pgx=32&pid=274&job_id=Cards_475" as described above all now works well
However when the item is not in the cart, ie different item I get an error message "Cart-A.php" on line 238" which is line 238= " <?php echo "Job ID: ". $_SESSION['PBksID']; ?>"
Do I use something like this in front of the code "if(isset($_GET['job_id'])) " so that I dont get an error if the code is not there.
I have this at the top of the cart summary page: <?php
if (!session_id()) session_start();
// store session data