php实现cc攻击防御和防止快速刷新页面示例

<?php
//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;
}
?>