/**
 * 获取两个时间之间的日期
 * @param $startDate
 * @param $endDate
 * @return array
 */
function getDatesBetweenTwoDays($startDate, $endDate)
{
    $dates = [];
    if (strtotime($startDate) > strtotime($endDate)) {
        // 如果开始日期大于结束日期，直接return 防止下面的循环出现死循环
        return $dates;
    } elseif ($startDate == $endDate) {
        // 开始日期与结束日期是同一天时
        array_push($dates, $startDate);
        return $dates;
    } else {
        array_push($dates, $startDate);
        $currentDate = $startDate;
        do {
            $nextDate = date('Y-m-d', strtotime($currentDate . ' +1 days'));
            array_push($dates, $nextDate);
            $currentDate = $nextDate;
        } while ($endDate != $currentDate);

        return $dates;
    }
}

参考：
https://blog.csdn.net/qq_28766327/article/details/79237575