// Cria um Array
            $list = array ();

            // Inclui os resultados no array
            array_push($list, array("## START OF USER TABLE ##"));
            while ($row = $result_users->fetch(PDO::FETCH_ASSOC)) {
                array_push($list, array_values($row));
            }
            array_push($list, array("## END OF USER TABLE ##"));

            // Gera o .csv
            $fp = fopen('php://output', 'w');
            header('Content-Type: text/csv');
            header('Content-Disposition: attachment; filename="'.$filename.'"');
            foreach ($list as $ferow) {
                fputcsv($fp, $ferow);
            }