Shopping cart application question

I am writing a shopping cart application.  I am expanding the application
to have a store membership component.

Right now I am saving the customers selections in one of two ways:
- In the session variable "$_SESSION['order']" if they aren't logged in
- For those who have logged into their account I am saving their
selections in the table "membership_shopping_carts"

I have ran into trouble trying to output their choices under the "cart
contents" heading.  I want to invoke one of two loops --- A 'while' loop
for the session variable and a mySQL query for the logged in users.

The " } else { " confuses PHP.  I am not sure what I should be doing.

$_SESSION['user_reference'] stores the value of the logged in user.  This
is how I tell if s/he is logged in or not --- and which loop I want to
invoke.

Suggestions?

Ron

if ( $_SESSION['user_reference'] > 0 ) {

$user_reference = $_SESSION['user_reference'];
$query = "SELECT `store_product_profile`.`reference` FROM
`membership_shopping_carts` INNER JOIN `store_product_profile` on
`store_product_profile`.`reference` =
`membership_shopping_carts`.`store_product_profile_reference` WHERE
`membership_shopping_carts`.`member_reference` = $user_reference ORDER BY
`store_product_profile`.`product_name` ASC";
$shopping_cart_content_result=mysql_query($query);
$cart_records_found=mysql_numrows($shopping_cart_content_result);

$i=0;
while ( $i < $cart_records_found ) {

} else {

foreach ($_SESSION['order'] AS $key => $value ) {

}