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<?php
interface FlyableThingInterface
{
    public function fly();
}

interface AnimalInterface
{
    public function eat();
}

interface FlyingAnimalInterface extends AnimalInterface, FlyableThingInterface
{
}

interface AirplaneInterface extends FlyableThingInterface
{
}

trait HerbivoreTrait
{
    public function eat()
    {
        echo 'The herbivore eats plant material.' . PHP_EOL;
    }
}

trait CarnivoreTrait
{
    public function eat()
    {
        echo 'The carnivore eats meat.' . PHP_EOL;
    }
}

trait OmnivoreTrait
{
    public function eat()
    {
        echo 'The omnivore eats plant material and meat.' . PHP_EOL;
    }
}

trait FlyingAnimalTrait
{
    public function fly()
    {
        echo 'The animal flies.' . PHP_EOL;
    }
}

trait AirplaneTrait
{
    public function fly()
    {
        echo 'The airplane flies.' . PHP_EOL;
    }
}

class Lion implements AnimalInterface
{
    use CarnivoreTrait;
}

class Elephant implements AnimalInterface
{
    use HerbivoreTrait;
}

class Bird implements FlyingAnimalInterface
{
    use OmnivoreTrait;
    use FlyingAnimalTrait;
}

class JumboJet implements AirplaneInterface
{
    use AirplaneTrait;
}

$aLion      = new Lion();
$anElephant = new Elephant();
$aBird      = new Bird();
$aJumboJet  = new JumboJet();

$aLion->eat();
// The carnivore eats meat.

$anElephant->eat();
// The herbivore eats plant material.

$aBird->eat();
// The omnivore eats plant material and meat.
$aBird->fly();
// The animal flies.

$aJumboJet->fly();
// The airplane flies.