两个日期之间的所有时间

function DateRange ($begin,$end,$interval='M'){
$begin = new DateTime($begin);
$end   = new DateTime($end);
$end = $end->modify('+1 day');
$t ='P1'.$interval;
$interval = new DateInterval($t);
$daterange = new DatePeriod($begin, $interval ,$end);

foreach($daterange as $date){
$range[]= $date->format("Ymd");
}
return $range;
}