$ curl ipinfo.io/8.8.8.8
{
  "ip": "8.8.8.8",
  "hostname": "google-public-dns-a.google.com",
  "loc": "37.385999999999997 -122.0840",
  "org": "AS15169 Google Inc.",
  "city": "Isparta",
  "region": "TR",
  "country": "TR",
  "phone": 650
}

$ip = $_SERVER['REMOTE_ADDR'];
$details = json_decode(file_get_contents("http://ipinfo.io/{$ip}"));
echo $details->city; // -> "Istanbul"

<?php
 
include 'class.IPInfoDB.php';
 
// Load the class
$ipinfodb = new IPInfoDB('YOUR_API_KEY');
 
$results = $ipinfodb->getCity($_SERVER['REMOTE_ADDR']);
 
echo "Result
\n";
if (!empty($results) && is_array($results)) {
 foreach ($results as $key => $value) {
 echo $key . ' : ' . $value . "
\n";
 }
}