获取用户的ip

		public  function getClientIP()
		    {
		        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 addslashes($realip);
		    }