public function allActive(bool $slugify = true): array
    {
        global $blog_id; // Blog ID.

        $cache_key = '_'.(int) $blog_id.(int) $slugify;

        if (isset(static::$cache[__FUNCTION__][$cache_key])) {
            return static::$cache[__FUNCTION__][$cache_key];
        }
        $active         = $this->active($slugify);
        $network_active = $this->networkActive($slugify);
        $all_active     = array_merge($active, $network_active);

        if (!$slugify) { // Numeric keys.
            $all_active = array_unique($all_active);
        }
        return static::$cache[__FUNCTION__][$cache_key] = $all_active;
    }