在大写字母前面加_var_dump(preg_replace('/\B(?<![A-Z])[A-Z]\B/', '_${0}', $test)); 相关文章: 2021-11-22 2022-12-23 2022-12-23 2022-12-23 2022-12-23 2021-07-07 2022-12-23 2022-02-07