PHP Enum class

Just jumped out from java to write small thing in php, so I've started like enum Roles { and remembered that there's no "enum" in php, so I've made my small wrapper

<?php

class Enum {
    public static function values() {
        return array_values(self::keyValues());
    }

    public static function keys() {
        return array_keys(self::keyValues());
    }

    public static function keyValues() {
        try {
            $rc = new \ReflectionClass(get_called_class());
        } catch (\ReflectionException $e) {
            error_log($e->getMessage());
        }
        return $rc->getConstants();
    }
}

class MyEnum extends Enum {
    public CONST SOME = 1;
    public CONST ANOTHER = 2;
}

var_dump(MyEnum::keys());