(PHP 5 >= 5.6.5, PHP 7, PHP 8)
DatePeriod::getEndDate — Gets the end date
此函数没有参数。
   Returns null if the DatePeriod does
   not have an end date. For example, when initialized with the
   recurrences parameter, or the
   isostr parameter without an
   end date.
  
   Returns a DateTimeImmutable object
   when the DatePeriod is initialized with a
   DateTimeImmutable object
   as the end parameter.
  
Returns a cloned DateTime object representing the end date otherwise.
示例 #1 DatePeriod::getEndDate() example
<?php
$period = new DatePeriod(
    new DateTime('2016-05-16T00:00:00Z'),
    new DateInterval('P1D'),
    new DateTime('2016-05-20T00:00:00Z')
);
$start = $period->getEndDate();
echo $start->format(DateTime::ISO8601);以上示例会输出:
2016-05-20T00:00:00+0000
示例 #2 DatePeriod::getEndDate() without an end date
<?php
$period = new DatePeriod(
    new DateTime('2016-05-16T00:00:00Z'),
    new DateInterval('P1D'),
    7
);
var_dump($period->getEndDate());以上示例会输出:
NULL
