ip.php

<?php

$keys = ['REMOTE_ADDR', 'HTTP_CLIENT_IP', 'HTTP_X_FORWARDED_FOR'];
foreach ($keys as $key) { 
  $ip = $_SERVER[$key];
  echo $key . ' = ' . $ip;
  if ($ip != ''){ 
    $location = @json_decode(file_get_contents("http://www.geoplugin.net/json.gp?ip=".$ip));   
    if($location){
      echo ' (' . $location->geoplugin_city . ', ' . $location->geoplugin_countryName . ')';
    }       
  }       
  echo '<br>' . PHP_EOL;
}