php实现cc攻击防御和防止快速刷新页面示例

复制代码 代码如下:
<?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;
}
?>