How to check only if the parameter is present?

Question

Laravel

There is a code

$validator = Validator::make( $this -> request, array(

            'fio'	         => 'required',

            'city'		     => 'required',

            'phone'			 => 'required',

            'delivery_id'    => 'required|integer|exists:deliveries,id',

            'payment_id'     => 'required|integer|exists:payments,id',

            'warehouse'      => 'required'
        )
        );

        if ($validator->fails())
            return response()->json($validator->messages(), env('AJAX_ERROR') );

where $this -> request is an array with parameters, but there may not be a warehouse parameter , when it is not there, it is necessary for the validator to skip it, how to correctly organize this task?

Answer 1

remove required, it will no longer be required