LeaveRequest cannot handle exception when input the day belongs to blocked day

Leave request form example - part of a module

I have a problem in this part only. I dont know how to handle in the input. I have table Events(event_type_id, from_date,to_date). I have inserted a new event_type_id is 2 - Blocked day from day 13 to 15.

I have a table LeaveRequest(leave_from_date, leave_to_date). But i create a leave request from 13 to 15, i have created successfully but not handle the exception that if the Event blocked day from 13 to 15 but i input in LeaveRequest is from 13 to 15, it must send error.

I use Laravel framework and in my LeaveRequest for handle input, i just handle the leave_status only

public function rules()
    {
        return $rules = [
            'leave_status' => 'required|integer|between:0,3',
          ]; 
    }

Is there anyway to handle error like this. Thank you. I have done for 5 days but no solution.

via Chebli Mohamed