PHP: instanceof

[Xenos]

Code PHP :

<?php 

interface Vehicule {

    public function getColor();

}

interface Voiture extends Vehicule {

    public function circulerEnVille();

}

interface Camion extends Vehicule {

    public function attacherRemorque();

}

interface Moto extends Vehicule {

    public function roulerSurRoueArriere();

}

class AmericanTruck implements  Camion {

}

class Davidson implements Moto {

}



class Irma {

    public function acheterVehicule(Vehicule $vehicule) {

        if ($vehicule instanceof Camion)

              echo "Okay I buy it";

        else

              echo "I'll only buy it for half its price";

    }

}