ipの大陸、国、地域を配列にpush

$audience = array("date"=>"2018-04-18 08:05:50", "ip"=>"198.7.31.23", "visit"=>"Returned User");

$ip_addr = $audience["ip"];

require_once 'vendor/autoload.php';
use GeoIp2\Database\Reader;

$reader = new Reader('GeoLite2-City.mmdb');
$record = json_decode(json_encode($reader->city($ip_addr)));

$continent = $record->continent->names->en;
$contry = $record->country->names->en;
$city = $record->city->names->en;

$audience = $audience + array('continent'=>$continent, 'contry'=>$contry, 'city'=>$city);

print_r("<pre>");
var_dump($audience);
print_r("</pre>");

きた！