今天分享一下PHP如何防CC攻击。

<?php
empty($_SERVER['HTTP_VIA']) or exit('Access Denied');
session_start();

$seconds = 10; //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){
		//跳转验证
		$url = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
		$msg = '<title>安全检查</title><h3>检测到CC攻击，正在进行浏览器安全检查！</h3>';
		exit($msg . "<meta http-equiv='refresh' content='3;url={$url}'>"); //3是定时跳转的时间，后期可以根据时间段调整跳转时间
	}
}else{
	$_SESSION['refresh_times'] = 0;
	$_SESSION['last_time'] = $cur_time;
}