都道府県enum

gistfile1.txt

class Prefecture extends Enum
{
    const HOKKAIDO = "北海道";
    const AOMORI = "青森";
    const IWATE = "岩手";
    const MIYAGI = "宮城";
    const AKITA = "秋田";
    const YAMAGATA = "山形";
    const FUKUSHIMA = "福島";
    const IBARAKI = "茨城";
    const TOCHIGI = "栃木";
    const GUNMA = "群馬";
    const SAITAMA = "埼玉";
    const CHIBA = "千葉";
    const TOKYO = "東京";
    const KANAGAWA = "神奈川";
    const NIIGATA = "新潟";
    const TOYAMA = "富山";
    const ISHIKAWA = "石川";
    const FUKUI = "福井";
    const YAMANASHI = "山梨";
    const NAGANO = "長野";
    const GIFU = "岐阜";
    const SHIZUOKA = "静岡";
    const AICHI = "愛知";
    const MIE = "三重";
    const SHIGA = "滋賀";
    const KYOTO = "京都";
    const OSAKA = "大阪";
    const HYOGO = "兵庫";
    const NARA = "奈良";
    const WAKAYAMA = "和歌山";
    const TOTTORI = "鳥取";
    const SHIMANE = "島根";
    const OKAYAMA = "岡山";
    const HIROSHIMA = "広島";
    const YAMAGUCHI = "山口";
    const TOKUSHIMA = "徳島";
    const KAGAWA = "香川";
    const EHIME = "愛媛";
    const KOCHI = "高知";
    const FUKUOKA = "福岡";
    const SAGA = "佐賀";
    const NAGASAKI = "長崎";
    const KUMAMOTO = "熊本";
    const OITA = "大分";
    const MIYAZAKI = "宮崎";
    const KAGOSHIMA = "鹿児島";
    const OKINAWA = "沖縄";
}

gistfile2.txt

abstract class Enum
{
    private $scalar;

    public function __construct($value)
    {
        $ref = new \ReflectionObject($this);
        $consts = $ref->getConstants();
        if (!in_array($value, $consts, true)) {
            throw new \InvalidArgumentException;
        }

        $this->scalar = $value;
    }

    final public static function __callStatic($label, $args)
    {
        $class = get_called_class();
        $const = constant("$class::$label");

        return new $class($const);
    }

    final public function valueOf()
    {
        return $this->scalar;
    }

    final public function __toString()
    {
        return (string)$this->scalar;
    }
}