PHP上传文件仿微信文件名命名

   public function uploadFile(Request $request)
    {
        // $data = json_decode(file_get_contents("php://input"), true);
        $userId = request()->userid;
        if (!$userId) return $this->responseJson(self::CODE_USER_NOT_EXIST, trans('api.user.notExist'));
        $file = $request->file('file');
        Log::channel('notify')->info($file);
        //获取文件名 
        $fileName = $file->getClientOriginalName();
        $fileSize = $file->getClientSize();
        $fileType = $file->guessClientExtension();
        $path = 'upload\\' . $userId . '\\';

        //判断文件是否存在
        $exists = Storage::disk('public')->exists($path . $fileName);

        if ($exists) {
            //存在，改名
            $houzhui = '.' . substr(strrchr($fileName, '.'), 1);
            $result = substr($fileName, 0, '-' . strlen($houzhui));
            for ($i = 1; $i < 1000; $i++) {
                $saveName = iconv("utf-8", "gb2312", $result . '(' . $i . ')' . $houzhui);
                $exists = Storage::disk('public')->exists($path . $saveName);
                if (!$exists) {
                    $fileName =  $result . '(' . $i . ')' . $houzhui;
                    $name = $result . '(' . $i . ')' . $houzhui;
                    break;
                }
            }
        }

        $upload = $request->file('file')->storeAs(
            'public',
            $path . $fileName
        );

    }