php页面防止刷新代码

//代理IP直接退出

empty($_SERVER['HTTP_VIA']) or exit('Access Denied');

//防止快速刷新

session_start();

$seconds = '3'; //时间段[秒]

$refresh = '5'; //刷新次数

//设置监控变量

$cur_time = time();

if(isset($_SESSION['last_time'])){

    $_SESSION['refresh_times'] += 1;

}else{

    $_SESSION['refresh_times'] = 1;

    $_SESSION['last_time']     = $cur_time;

}

//处理监控结果

if($cur_time - $_SESSION['last_time'] < $seconds){

    if($_SESSION['refresh_times'] >= $refresh){

        //跳转至攻击者服务器地址

        header(sprintf('Location:%s', 'http://127.0.0.1'));

        exit('Access Denied');

    }

}else{

    $_SESSION['refresh_times'] = 0;

    $_SESSION['last_time'] = $cur_time;

}