获取下个月的月份

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//获取下个月的月份  public function getNextMonthDays($date){     $timestamp=strtotime($date);      $arr=getdate($timestamp);      if($arr['mon'] == 12){          $year=$arr['year'] +1;          $month=$arr['mon'] -11;         $firstday=$year.'-0'.$month.'-01';          $lastday=date('Y-m',strtotime("$firstday +1 month -1 day"));      }else{          $firstday=date('Y-m',strtotime(date('Y',$timestamp).'-'.(date('m',$timestamp)+1).'-01'));          $lastday=date('Y-m',strtotime("$firstday +1 month -1 day"));     }      return $lastday;  }