if(isset($_SERVER["HTTP_X_REQUESTED_WITH"]) && strtolower($_SERVER["HTTP_X_REQUESTED_WITH"])=="xmlhttprequest"){

            // ajax 请求的处理方式

        }else{

            exit( "invalid call 1!");

        };

        $who = $_SERVER['HTTP_REFERER'];

        if(substr($who,0,24) == "http://www.fudaobank.com" )

        {

            //echo "ok";

        }else{

            exit( "invalid call 2!");

        }