function GetIP()

    {

        $cip = "";

        if(!empty($_SERVER["HTTP_CLIENT_IP"])){

           $cip = $_SERVER["HTTP_CLIENT_IP"];

        }

        if(!empty($_SERVER["REMOTE_ADDR"])){

           $cip = $_SERVER["REMOTE_ADDR"];

        }

        if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"])){

           $cip = $_SERVER["HTTP_X_FORWARDED_FOR"];

        }

        return $cip;

    }

    $ch = curl_init();

    $url = 'http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip='.GetIP();

    $json = file_get_contents($url);

    $ip_data = json_decode($json, true);

    /*$header = array(

        'apikey:a49f5d21a5deead357e9faf3895f0907',

    );

    // 添加apikey到header

    curl_setopt($ch, CURLOPT_HTTPHEADER  , $header);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    // 执行HTTP请求

    curl_setopt($ch , CURLOPT_URL , $url);

    $res = curl_exec($ch);

    $ip_data = json_decode($res,true);*/

    $ipaddress = $ip_data['retData']['province'].$ip_data['retData']['city'];

    if(strpos($ipaddress,'北京')===false){

        header("Location:index(tuibeifen).php");

    }

<?php

    function GetIP()

    {

        $cip = "";

        if(!empty($_SERVER["HTTP_CLIENT_IP"])){

           $cip = $_SERVER["HTTP_CLIENT_IP"];

        }

        if(!empty($_SERVER["REMOTE_ADDR"])){

           $cip = $_SERVER["REMOTE_ADDR"];

        }

        if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"])){

           $cip = $_SERVER["HTTP_X_FORWARDED_FOR"];

        }

        return $cip;

    }

    $ch = curl_init();

    $url = 'http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip='.GetIP();

    $json = file_get_contents($url);

    $ip_data = json_decode($json, true);

    /*$header = array(

        'apikey:a49f5d21a5deead357e9faf3895f0907',

    );

    // 添加apikey到header

    curl_setopt($ch, CURLOPT_HTTPHEADER  , $header);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    // 执行HTTP请求

    curl_setopt($ch , CURLOPT_URL , $url);

    $res = curl_exec($ch);

    $ip_data = json_decode($res,true);*/

    $ipaddress = $ip_data['province'].$ip_data['city'];

    if(strpos($ipaddress,'北京')===false){

        header("Location:../huangheban/index.php");

    }

?>