Some parameters in the search listing page

Hello everyone.

After searching I see the list page only the search parameters used.
I tried the following code, but without result.
I entered the event: Search page_ Before display
//** Custom code ****

// Start code
$w1=$_REQUEST["value_Cap"];

$w2=$_REQUEST["value_Comune"];
$search_params="These are the results from ".$w1." to ".$w2.";";
echo $search_params;

// end code
Can you give me some examples?

Thanks for the information