<?php
abstract class Rownanie
{
    abstract protected function wyswietl();
    abstract protected function setDane($dane);
}

class Dane extends Rownanie
{
    private $tab;

    public function __construct(){
        $this->tab = array(0,1,2,3);
    }

    public function wyswietl(){}
    public function setDane($dane){
        $this->tab[0] = 4;
        $this->tab[1] = 5;
        $this->tab[2] = 3;
        $this->tab[3] = 2;
    }

}

?>