Advanced Search - customized product fields?

[Bikeforce]

What I think I need to do is use the php unset function to take out fields from the array if the result has no value....

Below i am trying to take out AP

- Its not working



$define_list = array('PRODUCT_LIST_MODEL' => PRODUCT_LIST_MODEL,
'PRODUCT_LIST_NAME' => PRODUCT_LIST_NAME,
'PRODUCT_LIST_MANUFACTURER' => PRODUCT_LIST_MANUFACTURER,
'PRODUCT_LIST_PRICE' => PRODUCT_LIST_PRICE,
'PRODUCT_LIST_THREAD_M' => PRODUCT_LIST_THREAD_M,
'PRODUCT_LIST_D' => PRODUCT_LIST_D,
'PRODUCT_LIST_L' => PRODUCT_LIST_L,
'PRODUCT_LIST_H' => PRODUCT_LIST_H,
'PRODUCT_LIST_AP' => PRODUCT_LIST_AP,
'PRODUCT_LIST_QUANTITY' => PRODUCT_LIST_QUANTITY,
'PRODUCT_LIST_WEIGHT' => PRODUCT_LIST_WEIGHT,
'PRODUCT_LIST_IMAGE' => PRODUCT_LIST_IMAGE);




if ($listing->fields['AP']=='0')

{
unset($define_list ['PRODUCT_LIST_AP']);
}



- I think I need to change $listing->fields to something but dont know what - I know it is $product_info->fields on product info pages etc but dont know on this one. If there is a better way then, please let me know the solution...