oop2.php

<?php
header('Content-Type: text/html; charset=utf-8');
class Cars{
    protected $mark;// марка
    public $type; // тип
    public $tonnage; // тонаж
    protected $places; // места
    public function setMark($mark,$places){
        echo $mark . " " . $places . " мест";
    }
}
class  Truck extends Cars {
    public function __construct(){
        echo $this->mark = "MAN ";
        echo $this->type = "Грузовик ";
        echo $this->tonnage = 20 ." тон";
    }

}
class Bus extends Cars{
    public function __construct($mark,$places){
        echo $mark . " " . $places . " мест";
    }
    public function GetMark()
    {
        echo $this->mark = "RENO";
        echo $this->type = " Автобус " ;
    }


}
$truck = new Truck();
echo "<br>";
echo "<br>";
$bus = new Bus("Газель",20);
echo "<br>";echo "<br>";
$bus->GetMark();
echo "<br>";
$bus->setMark("Volvo",70);
echo "<br>";
$bus->setMark("Газель",100500);