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';
$lastday=date('Y-m-d',strtotime("$firstday +1 month -1 day"));
}else{
$firstday=date('Y-m-01',strtotime(date('Y',$timestamp).'-'.(date('m',$timestamp)+1).'-01'));
$lastday=date('Y-m-d',strtotime("$firstday +1 month -1 day"));
}
return array($firstday,$lastday);
}
print_r(getNextMonthDays(date('Y-m-d')));