private static function find_multiple($name, $source, $option)
    {
        $sep    = Helper::arrGet($option, 'separator', '_');
        $suffix = explode(',', $option['suffix']);
        $lists  = [];
        foreach ($suffix as $sfx) {
            $name_sfx = $name . $sep . $sfx;
            if (array_key_exists($name_sfx, $source) && trim($source[$name_sfx])) {
                $lists[] = trim($source[$name_sfx]);
            }
        }

        return $lists;
    }