Object Oriented PHP

Rippotai.php

<?php

class Rippotai {

    private $tate;
    private $yoko;
    private $takasa;

    public function __construct($tate,$yoko,$takasa){
        $this->tate = $tate;
        $this->yoko = $yoko;
        $this->takasa = $takasa;
    }

    public function teimennseki(){
        return $this->tate * $this->yoko;
    }

    public function taiseki(){
        return $this->tate * $this->yoko * $this->takasa;
    }
}

use.php

<?php

require "sample.php";

$ripo = new Rippotai(5,5,5);
echo $ripo->teimennseki();