IPアドレスから居住国のPHPコードを取得する

function getLocationInfoByIp(){
 $client = @$_SERVER['HTTP_CLIENT_IP'];
 $forward = @$_SERVER['HTTP_X_FORWARDED_FOR'];
 $remote = @$_SERVER[' REMOTE_ADDR'];
 $result = array('country'=>'', 'city'=>'');
 if(filter_var($client, FILTER_VALIDATE_IP)){
 $ip = $client;
 } elseif(filter_var($forward, FILTER_VALIDATE_IP)){
 $ip = $forward;
 }else{
 $ip = $remote;
 }
 $ip_data = @json_decode
(file_get_contents("http://www.geoplugin. net/json.gp?ip=".$ip));
 if($ip_data && $ip_data->geoplugin_countryName != null){
 $result['country'] = $ip_data->geoplugin_countryCode;
 $ result['city'] = $ip_data->geoplugin_city;
 }
 return $result;
}
?>

PHP