validasi upline_id

// validasi upline id harus valid
        if($input['upline_id']!=""){
            $findUplineId = \DB::table('mlm_member')->where('upline_id', $input['upline_id'])->first();
            if($findUplineId == null){
                return \Response::json([
                        "status" => "FAIL",
                        "errorKey" => "Upline ID tidak terdaftar"
                ]);
            }
        }