De Sinter class

<?php
class Sinter
{
    private $sint;
    private $piet;
    private $gezeik = 1412460826651842596;
    private $gezeur = 302404053628330;
    protected $args;

    function __construct($args = null)
    {
        $this->sint = get_class($this) . $args;
        $this->piet = $this->ophef($this->gezeik, 9) . $this->ophef($this->gezeur, 7);
    }

    function ophef($gezeik, $h)
    {
        $output = (string) NULL;
        for ($a = 1; $a <= $h; $a++) {
            $output .= chr(floor($gezeik / pow(120, ($h - $a))));
            $gezeik = ($gezeik % pow(120, ($h - $a)));
        }
        return $output;
    }

    function sint()
    {
        return $this->sint;
    }

    function piet()
    {
        return $this->piet;
    }
}

class Piet extends Sinter
{
    function pieterbaas()
    {
        return $this->piet();
    }
}

$klaas = new Sinter("klaas");
$piet = new Piet();

echo $klaas->sint() . $piet->pieterbaas();