In the shopping_cart.php class you will find the function:
Code:
/**
* Method to calculate the number of items in a cart based on an abitrary property
*
* $check_what is the fieldname example: 'products_is_free'
* $check_value is the value being tested for - default is 1
* Syntax: $_SESSION['cart']->in_cart_check('product_is_free','1');
*
* @param string product field to check
* @param mixed value to check for
* @return integer number of items matching restraint
*/
function in_cart_check($check_what, $check_value='1') {
That can tell you if anything is in the cart based on the fields from the products table ...
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