php 获取客户端ip

 1 function getRealIp() {

 2         if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))

 3            $ip = getenv("HTTP_CLIENT_IP");

 4         else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))

 5            $ip = getenv("HTTP_X_FORWARDED_FOR");

 6         else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))

 7            $ip = getenv("REMOTE_ADDR");

 8         else if (isset($_SERVER[‘REMOTE_ADDR‘]) && $_SERVER[‘REMOTE_ADDR‘] && strcasecmp($_SERVER[‘REMOTE_ADDR‘], "unknown"))

 9            $ip = $_SERVER[‘REMOTE_ADDR‘];

10         else

11            $ip = "unknown";

12         return($ip);

13     }

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