get all class constants

Question

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Can I get CONST's defined on a PHP class?

Is there a way to do get all the constants in a php class. Tried get_class_vars( get_called_class() )

    class Status
{        
    const PUBLISHED = "published";
    const DRAFT = "draft";

    public static function get_types()
    {
        return array(self::PUBLISHED, self::DRAFT);
    }
}

Thanks