获取IP

function GetIP(){
if(!empty($_SERVER["HTTP_CLIENT_IP"]))
   $cip = $_SERVER["HTTP_CLIENT_IP"];
else if(!empty($_SERVER["HTTP_X_FORWARDED_FOR"]))
   $cip = $_SERVER["HTTP_X_FORWARDED_FOR"];
else if(!empty($_SERVER["REMOTE_ADDR"]))
   $cip = $_SERVER["REMOTE_ADDR"];
else
   $cip = "无法获取！";
return $cip;
}