ENUM Experiment

enum.php

<?php

namespace Enum {
    abstract class Enum {
        public function __toString() {
            return get_called_class();
        }
        public static function types() {
            $thisclass = get_called_class();
            if (get_parent_class($thisclass) !== __CLASS__) {
                throw new \Exception('You may only call types() on parent enums, not their children');
            }
            $children = array();
            foreach (get_declared_classes() as $class) {
                if (is_subclass_of($class, $thisclass)) {
                    $children[] = $class;
                }
            }
            return $children;
        }
    }
}

namespace Enum\Gender {
    use Enum;
    abstract class Gender extends Enum\Enum {}
    final class Male extends Gender {}
    final class Female extends Gender {}
}

namespace Enum\Eyecolor {
    use Enum;
    abstract class Eyecolor extends Enum\Enum {}
    final class Blue extends Eyecolor {}
    final class Green extends Eyecolor {}
    final class Yellow extends Eyecolor {}
    final class Red extends Eyecolor {}
    final class Brown extends Eyecolor {}
    final class Orange extends Eyecolor {}
    final class Pink extends Eyecolor {}
    final class Black extends Eyecolor {}
    final class SoulStealing extends Eyecolor {}
}

namespace Userlandcode {

    use Enum;

    function echoGender1(Enum\Gender\Gender $gender) {
        if ($gender instanceof Enum\Gender\Male) {
            echo "Hey dude! -- " . $gender . "\n";
        }
        elseif ($gender instanceof Enum\Gender\Female) {
            echo "Hey dudette! -- " . $gender . "\n";
        }
        else {
            echo "Hey...you.\n";
        }
    }

    echoGender1(new Enum\Gender\Male);
    echoGender1(new Enum\Gender\Female);

    $male = new Enum\Gender\Male;
    echoGender1($male);

    function echoGender2(Enum\Gender\Gender $gender) {
        switch ($gender) {
            case (new Enum\Gender\Male):   echo "Hey dude! -- " . $gender . "\n"; break;
            case (new Enum\Gender\Female): echo "Hey dudette! -- " . $gender . "\n"; break;
            default: echo "Hey...you\n"; break;
        }
    }

    echoGender2(new Enum\Gender\Male);
    echoGender2(new Enum\Gender\Female);

    $male = new Enum\Gender\Male;
    echoGender2($male);

    echo 'Genders: ' . print_r(Enum\Gender\Gender::types(), 1);
    echo 'Eye colors: ' . print_r(Enum\Eyecolor\Eyecolor::types(), 1);
    try {
    echo 'Lol, nope: ' . print_r(Enum\Eyecolor\Green::types(), 1);
    } catch (\Exception $e){
        echo "Exception: " . $e->getMessage() . "\n";
    }

}