我有两个字段只有在两个字段都不存在时才是可选的:
$rules = [
'initial_page' => 'required_with:end_page|integer|min:1|digits_between: 1,5',
'end_page' => 'required_with:initial_page|integer|min:2|digits_between:1,5'
];
现在,end_page需要大于initial_page.如何包含此过滤器？