New search query

function bedrooms_guests_search_query( $query ) {
   if (! is_admin() && $query->is_main_query()) {

    $custom_fields = array(
        // put all the meta fields you want to search for here
        "function_camere","function_ospiti"

    );
    $searchterm = $query->query_vars['tipologia'];

    // we have to remove the "s" parameter from the query, because it will prevent the posts from being found
    $query->query_vars['s'] = "";

    if ($searchterm != "") {
        $meta_query = array('relation' => 'OR');
        foreach($custom_fields as $tipologia) {
            array_push($meta_query, array(
                'key' => $tipologia,
                'value' => $searchterm,
                'compare' => 'LIKE'
            ));
        }

if ( array_key_exists('funzione_camere', $_GET ) && $searchterm != "")

if ( array_key_exists('funzione_ospiti', $_GET ) && $searchterm != "")

        $query->set("meta_query", $meta_query);
    };
}
add_filter( "pre_get_posts", "bedrooms_guests_search_query");

   }
}