<?php
interface SizeInterface {
    public function getSize(): string;
}

enum Size: string implements SizeInterface {
    case Small = 'small';
    case Grande = 'grande';

    public function getSize(): string {
        return $this->value;
    }
}


class Coffee {
    public string $flavor {
       get { 
            return $this->flavor . ' Spice';
       }
        set(string $value) {
            if (strlen($value) > 16) throw new InvalidArgumentException('Input is too long');
                $this->flavor = $value;
        }
    }

    public function serve(SizeInterface $size): void {
        echo "\r\nServing a {$size->getSize()} coffee.\n";
    }
}

$coffee = new Coffee();
$coffee->flavor = 'Pumpkin';
echo $coffee->flavor;

$coffee->serve(Size::Grande);