Laravel multiple fields validation not working

Question

I'm trying to validate three input fields.

If the fields are null then the three fields are not mandatory, but If at least one of them is not empty (null) then all three should be mandatory. But It's doesn't working. If I leave all three fields blank It shows that the three fields are mandatory. It shoud allow the form to be submitted.

public function rules()
    {
      return [
        'a' => 'required_if:b,!=,null|required_if:c,!=,null',
        'b' => 'required_if:a,!=,null|required_if:c,!=,null',
        'c' => 'required_if:a,!=,null|required_if:b,!=,null',
      ];
    }

Answer 1

Dale suggests using required_with instead of required_if , however you can use Preparing Input For Validation it will do the trick.