PHP实现IP自动判断城市效能

<?php  

function GetIP() {

if ($_SERVER["HTTP_X_FORWARDED_FOR"])

$ip = $_SERVER["HTTP_X_FORWARDED_FOR"];

else if ($_SERVER["HTTP_CLIENT_IP"])

$ip = $_SERVER["HTTP_CLIENT_IP"];

else if ($_SERVER["REMOTE_ADDR"])

$ip = $_SERVER["REMOTE_ADDR"];

else if (getenv("HTTP_X_FORWARDED_FOR"))

$ip = getenv("HTTP_X_FORWARDED_FOR");

else if (getenv("HTTP_CLIENT_IP"))

$ip = getenv("HTTP_CLIENT_IP");

else if (getenv("REMOTE_ADDR"))

$ip = getenv("REMOTE_ADDR");

else

$ip = "Unknown";

return $ip;

}

 $ip=GetIP();

$bb='123.53.228.184';

$json=file_get_contents('http://ip.taobao.com/outGetIpInfo?ip='.$ip.'&accessKey=alibaba-inc');

$arr=json_decode($json);

$city= $arr->data->region;    //省份

echo $arr->data->country; //国家
echo $arr->data->area; //区域
echo $arr->data->region; //省份
echo $arr->data->city; //城市
echo $arr->data->isp; //运营商

//echo $city;

if ($city=='山东'){

echo "<SCRIPT LANGUAGE='javascript'>";

echo "location.href='/404.html'";

echo "</SCRIPT>";

  exit();

  die;

}

if ($city=='山东'){

echo "<SCRIPT LANGUAGE='javascript'>";

echo "location.href='/404.html'";

echo "</SCRIPT>";

  exit();

  die;

}