作为一个最低版本要求为PHP7.1的项目，多余的逗号会导致Parse error错误 https://github.com/top-think/think-helper/blame/fe277121112a8f1c872e169a733ca80bb11c4acb/src/helper/Arr.php#L479 https://github.com/top-think/think-helper/blame/fe277121112a8f1c872e169a733ca80bb11c4acb/src/helper/Arr.php#L651
