<?php
header("content-type:text/html;charset=utf8");
highlight_file(__FILE__);

@error_reporting(1);
class baby 
{
    public $file;
    function __toString()      
    {
        if(isset($this->file))
        {
            $filename = "./{$this->file}";
            if (file_get_contents($filename))
            {
                return file_get_contents($filename);
            }
        }
    }
}
if (isset($_GET['data']))
{
    $data = $_GET['data'];
    preg_match('/[oc]:\d+:/i',$data,$matches);
    if(count($matches))
    {
        die('Hacker!');
    }
    else
    {
        $good = unserialize($data);
        echo $good;
    }
}
else 
{
    highlight_file("./index.php");
}
?> <br>
flag:www.nanhack.com