PHP获取客户端IP地址的方法

 1 //获取客户端ip地址
 2 private function getRealIp() {
 3     if (isset($_SERVER)) {
 4         if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])) {
 5             $realIp = $_SERVER["HTTP_X_FORWARDED_FOR"];
 6         } else if (isset($_SERVER["HTTP_CLIENT_IP"])) {
 7             $realIp = $_SERVER["HTTP_CLIENT_IP"];
 8         } else {
 9             $realIp = $_SERVER["REMOTE_ADDR"];
10         }
11     } else {
12         if (getenv("HTTP_X_FORWARDED_FOR")) {
13             $realIp = getenv("HTTP_X_FORWARDED_FOR");
14         } else if (getenv("HTTP_CLIENT_IP")) {
15             $realIp = getenv("HTTP_CLIENT_IP");
16         } else {
17             $realIp = getenv("REMOTE_ADDR");
18         }
19     }
20     return $realIp;
21 }