$result = $handler->add($col);
    var_dump($result);
    // check if a collection exists
    $result = $handler->has("foobar");
    var_dump($result);
    // get an existing collection
    $result = $handler->get("hihi");
    var_dump($result);
    // get an existing collection
    $result = $handler->get("hihi");
    var_dump($result);
    // get number of documents from an existing collection
    $result = $handler->getCount("hihi");
    var_dump($result);
    // get figures for an existing collection
    $result = $handler->getFigures("hihi");
    var_dump($result);
    // delete the collection
    $result = $handler->delete("hihi");
    var_dump($result);
    // rename a collection
    // $handler->rename($col, "hihi30");
    // truncate an existing collection
    // $result = $handler->truncate("hihi");
} catch (ConnectException $e) {
    print $e . PHP_EOL;
} catch (ServerException $e) {
    print $e . PHP_EOL;
} catch (ClientException $e) {
    print $e . PHP_EOL;
}