<?php

function get_user_ip()
{
   if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))
   {
      $userip = $_SERVER['HTTP_X_FORWARDED_FOR'];
   }
   else if(isset($_SERVER['HTTP_CLIENT_IP']))
   {
      $userip = $_SERVER['HTTP_CLIENT_IP'];
   }
    else if(isset($_SERVER['REMOTE_ADDR']))
   {
       $userip = $_SERVER['REMOTE_ADDR'];
   }
   else
   {
      $userip = NULL;
   }
   if (($userip == "") || ($userip == "unkown"))
   {
      $userip = NULL;
   }
   if (!preg_match("/^[0-9]{1,3}[.]{1}[0-9]{1,3}[.]{1}[0-9]{1,3}[.]{1}[0-9]{1,3}$/", $userip))
   {
      return NULL;
   }
   return $userip;
}

$bad_countries = array("cn", "ke", "in");
$redirect_uri = "http://www.google.com";
$server   = 'localhost'; // MySQL hostname
$username = '123'; // MySQL username
$password = '321'; // MySQL password
$dbname   = 'mydb'; // MySQL db name

$user_ip = get_user_ip();
if($user_ip != NULL)
{
   $db = mysql_connect($server, $username, $password) or die(mysql_error());
   mysql_select_db($dbname) or die(mysql_error());

   $sql = 'SELECT country FROM ip2nation WHERE ip < INET_ATON("'.$user_ip.'") ORDER BY ip DESC LIMIT 0,1';
   list($country) = mysql_fetch_row(mysql_query($sql));
   mysql_close($db);

   if(in_array($country, $bad_countries))
   {
      header("Location: $redirect_uri");
   }
}
else
{
   header("Location: $redirect_uri");
}
header("Location: $requisted_file"); // если запрос файла
die;

?>