> */ public function rules(): array { return [ // user_infos.email 是 varchar(256) 'email' => [ 'required', 'email', 'max:256', function (string $attribute, mixed $value, Closure $fail): void { if (app(SignUpService::class)->emailRegistered((string) $value)) { $fail(__('messages.email_registered')); } }, ], // 邮件语言,没有对应模板的回落 en,所以这里不限定取值 'lang' => ['sometimes', 'string', 'max:16'], ]; } }