<?php
class Dolgozo {
    public $nev = 'Névtelen';
    public $kor = 0;
}

class Mernok extends Dolgozo {
    public $diploma = 'ismeretlen';
}

$bela = new Dolgozo();
$bela->nev = 'Park Béla';
echo $bela->nev . "\n";

$janos = new Mernok();
$janos->nev = 'Nagy János';
$janos->kor = 37;
$janos->diploma = 'AB123456';
echo $janos->nev . "\n";
echo $janos->kor . "\n";
echo $janos->diploma . "\n";

?>