PHP获取用户真实 IP , 淘宝IP接口获得ip地理位置(转)

 <?php
 /**
  * 获取用户真实 IP
  */
 function getIP()
 {
     static $realip;
     if (isset($_SERVER)){
         if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])){
             $realip = $_SERVER["HTTP_X_FORWARDED_FOR"];
         } else if (isset($_SERVER["HTTP_CLIENT_IP"])) {
             $realip = $_SERVER["HTTP_CLIENT_IP"];
         } else {
             $realip = $_SERVER["REMOTE_ADDR"];
         }
     } else {
         if (getenv("HTTP_X_FORWARDED_FOR")){
             $realip = getenv("HTTP_X_FORWARDED_FOR");
         } else if (getenv("HTTP_CLIENT_IP")) {
             $realip = getenv("HTTP_CLIENT_IP");
         } else {
             $realip = getenv("REMOTE_ADDR");
         }
     }

     return $realip;
 }

 /**
  * 获取 IP  地理位置
  * 淘宝IP接口
  * @Return: array
  */
 function getCity($ip)
 {
 $url="http://ip.taobao.com/service/getIpInfo.php?ip=".$ip;
 $ip=json_decode(file_get_contents($url));
 if((string)$ip->code=='1'){
   return false;
   }
   $data = (array)$ip->data;
 return $data;
 }