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<?php

abstract class ACanEat
{

    abstract public function eat($food);

    public function breath()
    {
        echo "Breath use the air." . "<br/>";
    }
}

class Human extends ACanEat
{

    public function eat($food)
    {
        echo "Human eating " . $food . "<br/>";
    }
}

class Animal extends ACanEat
{

    public function eat($food)
    {
        echo "Animal eating " . $food . "<br/>";
    }
}

$man = new Human();
$man->eat('apple');//Human eating apple
$man->breath();//Breath use the air.

$monkey = new Animal();
$monkey->eat('banana');//Animal eating banana
$monkey->breath();//Breath use the air.
?>

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