php sanitize input field

    $pname =  filter_var($_POST['pname'], FILTER_SANITIZE_STRING);

            $pdesc =  filter_var($_POST['pdesc'], FILTER_SANITIZE_STRING);

            $pterms = filter_var($_POST['pterms'], FILTER_SANITIZE_STRING);

            $picon =  filter_var($_POST['picon'] ,FILTER_SANITIZE_URL);

            $pbanner = filter_var($_POST['pbanner'],FILTER_SANITIZE_URL);