DatePeriod::__construct

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

DatePeriod::__constructCreates a new DatePeriod object

说明

public DatePeriod::__construct(
    DateTimeInterface $start,
    DateInterval $interval,
    int $recurrences,
    int $options = 0
)
public DatePeriod::__construct(
    DateTimeInterface $start,
    DateInterval $interval,
    DateTimeInterface $end,
    int $options = 0
)
public DatePeriod::__construct(string $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.

参数

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:

  1. zero occurrences (R0/)
  2. time offsets other than UTC (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.

更新日志

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.

范例

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$interval$endDatePeriod::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

注释

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.

add a note add a note

User Contributed Notes 3 notes

up
34
simon dot kohlmeyer at mayflower dot de
12 years ago
I found two things useful to know that aren't covered here.

1. endDate is excluded:

<?php
$i
= new DateInterval('P1D');
$d1 = new Datetime();
$d2 = clone $d1; $d2->add($i);
foreach(new
DatePeriod($d1, $i, $d2) as $d) {
    echo
$d->format('Y-m-d H:i:s') . "\n";
}
?>

Will output:
2010-11-03 12:39:53

(Another one because I got it wrong at first)
2. For the first form, recurrences really means REcurrences, not occurences.

<?php
$i
= new DateInterval('P1D');
$d = new Datetime();
foreach(new
DatePeriod($d, $i, 1) as $d) {
    echo
$d->format('Y-m-d H:i:s') . "\n";
}
?>

Will output:
2010-11-03 12:41:05
2010-11-04 12:41:05
up
14
lars at hp-designs dot com
10 years ago
When you add the time 23:59:59 to the end DateTime object something like the following then the end date will be included in the period:

<?php
$date_start
= new DateTime('2012-03-12');
$date_end = new DateTime('2012-03-22 23:59:59');

$interval = '+2 days';
$date_interval = DateInterval::createFromDateString($interval);

$period = new DatePeriod($date_start, $date_interval, $date_end, DatePeriod::EXCLUDE_START_DATE);

foreach(
$period as $dt) {
echo
$dt->format('d/m');
}
?>

OUTPUT:
14/03
16/03
18/03
20/03
22/03
up
0
youssef dot benhssaien at gmail dot com
2 years ago
The parameter isostr should accept an ISO 8601 format, but doing this is not work :
<?php
      $dateStart
= date_create('first day of next month this year');

     
$isoStr = $dateStart ->format(DateTimeInterface::ISO8601);
     
$datePeriod = new DatePeriod("R10/{$isoStr}/P1M");
    
// Throw Exception : DatePeriod::__construct(): Unknown or bad format (R10/2020-02-01T22:52:26+0000Z/P1M)
    
     // While doing it by this way works
   
$datePeriod = new DatePeriod($dateStart , \DateInterval::createFromDateString("+1 month"), 10);
?>
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