skeeks\cms\Config::appendFiles PHP Method

    public function appendFiles($files)
    {
        if (is_string($files)) {
            $this->files = array_merge($this->files, [$files]);
        } else {
            if (is_array($files)) {
                $this->files = array_merge($this->files, $files);
            } else {
                throw new Exception();
            }
        }
        return $this;
    }