$startDate = date("Y-m-01", strtotime($row->from_date));
                              $endDate = date("Y-m-d");
                              while($startDate <= $endDate){
                                    $dueYear=date("Y", strtotime($startDate));
                                    $dueMonth=date("m", strtotime($startDate));
                                    
                                    $dueCount=DueReport::where('student_id', $input['student_id'])->where('status','!=','cancelled')->where('subject_id',$row->subject_id )->whereYear('date',$dueYear )->whereMonth('date',$dueMonth)->count();
                                    .... 
                                    .... 
                                    
                                    $startDate=date("Y-m-d", strtotime("+1 month", strtotime($startDate)));                             
                              }