Sime Geo Targeting Script to Increase Amazon Sales

Here is the code

<?php
$res=file_get_contents("http://freegeoip.net/json/".get_ip_address());
$arr=explode(":",$res);
$seventhparam=explode(",",$arr[8]);
$countrycode=trim($seventhparam[0]);
$countrycode=str_replace('"','',$countrycode);
$countrycode=trim($countrycode,"");
$asin=$_GET['asin'];
if($countrycode=="GB")
{
$amzurl="http://www.amazon.co.uk/gp/product/".$asin."/?tag=Your UK Tag Here";
header("Location:".$amzurl);
}
else if($countrycode=="CA")
{
   $amzurl="http://www.amazon.ca/gp/product/".$asin."/?tag=Your CA Tag Here";
header("Location:".$amzurl);
}
else
{
$amzurl="http://www.amazon.ca/gp/product/".$asin."/?tag=Your US Tag Here";
header("Location:".$amzurl);
}
function get_ip_address() {
  foreach (array('HTTP_CLIENT_IP', 'HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_X_CLUSTER_CLIENT_IP', 'HTTP_FORWARDED_FOR', 'HTTP_FORWARDED', 'REMOTE_ADDR') as $key) {
  if (array_key_exists($key, $_SERVER) === true) {
  foreach (explode(',', $_SERVER[$key]) as $ip) {
  if (filter_var($ip, FILTER_VALIDATE_IP) !== false) {
  return $ip;
  }
  }
  }
  }
}
?>

PHP:

Save the file as amazon.php and upload it to the root directory of yourdomain.com.Visit yourdomain.com/amazon.php?=ASIN .