GeoIP显示实际代码而不是数据库的结果

Question

I'm trying to get the latest GeoIP package to work with my local wampserver. I have all of the files - autoload, databases, etc. - setup, at least as far as I know. The code I am using is:

require_once 'GeoIP2/autoload.php';
use GeoIp2/Database/Reader;

$reader = new Reader('GeoIP2/GeoLite2-City.mmdb');
$record = $reader->city('128.101.101.101');
print($record->country->isoCode . "
"); // 'US'

The above outputs

city('128.101.101.101'); 
print($record->country->isoCode . "
"); 
// 'US' 

I'm using php 5.6. There aren't any errors or warnings displayed anywhere that I can find. Does anyone know what I am missing or how to troubleshoot this?