~~~ if (!function_exists('create_sms_code')) { /** * note 生成验证码 * author cjh 2020/11/17 17:24 * @param int $length 验证码长度 * @return string */ function create_sms_code($length = 4) { $code = ''; for ($i = 0; $i < $length; $i++) { $code .= rand(0, 9); } return $code; } } ~~~