public function visible($var = null)
    {
        if ($var !== null) {
            $this->visible = (bool)$var;
        }

        if ($this->visible === null) {
            // Set item visibility in menu if folder is different from slug
            // eg folder = 01.Home and slug = Home
            if (preg_match(PAGE_ORDER_PREFIX_REGEX, $this->folder)) {
                $this->visible = true;
            } else {
                $this->visible = false;
            }
        }

        return $this->visible;
    }