According to their PHP Packagist repository page
https://packagist.org/packages/maxmind-db/reader
the following code is all I need to get the reader to work. PHP doesn't seem to like the use MaxMind\Db\Reader;
line. Any clue on how to fix this so it uses the reader.
require_once 'vendor/autoload.php';
use MaxMind\Db\Reader;
$reader = new Reader('GeoIP2-City.mmdb');
print_r($reader->get($_SERVER['REMOTE_ADDR']));
$reader->close()