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(PHP 5 >= 5.5.0, PHP 7, PHP 8)
DateTimeImmutable::setISODate — Sets the ISO date
Returns a new DateTimeImmutable object with the date set according to the ISO 8601 standard - using weeks and day offsets rather than specific dates.
year
Year of the date.
week
Week of the date.
dayOfWeek
Offset from the first day of the week.
返回带有修改数据的新 DateTimeImmutable 对象。
示例 #1 DateTimeImmutable::setISODate() example
面向对象风格
<?php
$date = new DateTimeImmutable();
$date->setISODate(2008, 2);
echo $date->format('Y-m-d') . "\n";
$date->setISODate(2008, 2, 7);
echo $date->format('Y-m-d') . "\n";
?>
过程化风格
<?php
$date = date_create();
date_isodate_set($date, 2008, 2);
echo date_format($date, 'Y-m-d') . "\n";
date_isodate_set($date, 2008, 2, 7);
echo date_format($date, 'Y-m-d') . "\n";
?>
以上例程会输出：
2008-01-07 2008-01-13
示例 #2 Values exceeding ranges are added to their parent values
<?php
$date = new DateTimeImmutable();
$newDate = $date->setISODate(2008, 2, 7);
echo $newDate->format('Y-m-d') . "\n";
$newDate = $date->setISODate(2008, 2, 8);
echo $newDate->format('Y-m-d') . "\n";
$newDate = $date->setISODate(2008, 53, 7);
echo $newDate->format('Y-m-d') . "\n";
?>
以上例程会输出：
2008-01-13 2008-01-14 2009-01-04
示例 #3 Finding the month a week is in
<?php
$date = new DateTimeImmutable();
$newDate = $date->setISODate(2008, 14);
echo $newDate->format('n');
?>
以上例程会输出：
3
