You can access this service using server IP address.Use PHP reserved variable to get IP.

$what_is_my_ip = $_SERVER['REMOTE_ADDR'];

echo var_export( unserialize( file_get_contents( 'http://www.geoplugin.net/php.gp?ip = '.$_SERVER['REMOTE_ADDR'] ) ) );

array (
   
   'geoplugin_request' => '182.75.235.222',
   
   'geoplugin_status' => 206,
   
   'geoplugin_credit' => 'Some of the returned data includes GeoLite data created by MaxMind, available from http://www.maxmind.com.',
   
   'geoplugin_city' => '',
   
   'geoplugin_region' => '',
   
   'geoplugin_areaCode' => '0',
   
   'geoplugin_dmaCode' => '0',
   
   'geoplugin_countryCode' => 'IN',
   
   'geoplugin_countryName' => 'India',
   
   'geoplugin_continentCode' => 'AS',
   
   'geoplugin_latitude' => '20',
   
   'geoplugin_longitude' => '77',
   
   'geoplugin_regionCode' => '',
   
   'geoplugin_regionName' => '',
   
   'geoplugin_currencyCode' => 'INR',
   
   'geoplugin_currencySymbol' => '₨',
   
   'geoplugin_currencySymbol_UTF8' => '₨',
   
   'geoplugin_currencyConverter' => '67.8358',
   
)

function getLocationInfoByIp($ip_addr)
{
   
   $return_data = array('country'=>'', 'city'=>'');
   
   $ip_data = @json_decode(file_get_contents("http://www.geoplugin.net/json.gp?ip=".$ip_addr));
   
   if($ip_data && $ip_data->geoplugin_countryName != null)
   
   {
   
   $ret = $ip_data->geoplugin_countryName;
   
   if($ip_data->geoplugin_city != null){
   
   $ret .= ', '.$ip_data->geoplugin_city;
   
   }
   
   return $ret;
  
   }  
}
  $loc=getLocationInfoByIp($_SERVER['REMOTE_ADDR']);