//获取ip地址

public static 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;

}