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(PHP 5 >= 5.3.0, PHP 7, PHP 8)
DatePeriod::__construct — Creates a new DatePeriod object
$start,$interval,$recurrences,$options = 0$start,$interval,$end,$options = 0$isostr, int $options = 0)Creates a new DatePeriod object.
DatePeriod objects can be used as an iterator to
generate a number of DateTimeImmutable or
DateTime object from a start
date, a interval, and an end
date or the number of recurrences.
The class of returned objects is equivalent to the
DateTimeImmutable or DateTime
ancestor class of the start object.
start
The start date of the period. Included by default in the result set.
interval
The interval between recurrences within the period.
recurrences
The number of recurrences. The number of returned results is
one higher than this, as the start date is included in the result set
by default. Must be greater than 0.
end
The end date of the period. Excluded by default from the result set.
isostr
A subset of the » ISO 8601 repeating interval specification.
Examples of some ISO 8601 interval specification features that PHP does not support are:
R0/)
Z), such as +02:00.
options
A bit field which can be used to control certain behaviour with start- and end- dates.
With DatePeriod::EXCLUDE_START_DATE you
exclude the start date from the set of recurring dates within the
period.
With DatePeriod::INCLUDE_END_DATE you
include the end date in the set of recurring dates within the
period.
| 版本 | 说明 |
|---|---|
| 8.2.0 |
The DatePeriod::INCLUDE_END_DATE constant has been added.
|
| 7.2.19, 7.3.6, 7.4.0 |
recurrences must be greater than 0 now.
|
示例 #1 DatePeriod example
<?php
$start = new DateTime('2012-07-01');
$interval = new DateInterval('P7D');
$end = new DateTime('2012-07-31');
$recurrences = 4;
$iso = 'R4/2012-07-01T00:00:00Z/P7D';
// All of these periods are equivalent.
$period = new DatePeriod($start, $interval, $recurrences);
$period = new DatePeriod($start, $interval, $end);
$period = new DatePeriod($iso);
// By iterating over the DatePeriod object, all of the
// recurring dates within that period are printed.
foreach ($period as $date) {
echo $date->format('Y-m-d')."\n";
}
?>
以上例程会输出：
2012-07-01 2012-07-08 2012-07-15 2012-07-22 2012-07-29
示例 #2 DatePeriod example with DatePeriod::EXCLUDE_START_DATE
<?php
$start = new DateTime('2012-07-01');
$interval = new DateInterval('P7D');
$end = new DateTime('2012-07-31');
$period = new DatePeriod($start, $interval, $end,
DatePeriod::EXCLUDE_START_DATE);
// By iterating over the DatePeriod object, all of the
// recurring dates within that period are printed.
// Note that, in this case, 2012-07-01 is not printed.
foreach ($period as $date) {
echo $date->format('Y-m-d')."\n";
}
?>
以上例程会输出：
2012-07-08 2012-07-15 2012-07-22 2012-07-29
示例 #3 DatePeriod example showing all last Thursdays in a year
<?php
$begin = new DateTime('2021-12-31');
$end = new DateTime('2022-12-31 23:59:59');
$interval = DateInterval::createFromDateString('last thursday of next month');
$period = new DatePeriod($begin, $interval, $end, DatePeriod::EXCLUDE_START_DATE);
foreach ($period as $dt) {
echo $dt->format('l Y-m-d'), "\n";
}
?>
以上例程会输出：
Thursday 2022-01-27 Thursday 2022-02-24 Thursday 2022-03-31 Thursday 2022-04-28 Thursday 2022-05-26 Thursday 2022-06-30 Thursday 2022-07-28 Thursday 2022-08-25 Thursday 2022-09-29 Thursday 2022-10-27 Thursday 2022-11-24 Thursday 2022-12-29
Unbound numbers of repetitions as specified by ISO 8601 section 4.5
"Recurring time interval" are not supported, i.e. neither passing
"R/..." as isostr nor passing
null as end would work.
