(PHP 5 >= 5.2.0)
DateTime::setISODate -- date_isodate_set — Sets the ISO date
面向对象风格
过程化风格
Set a date according to the ISO 8601 standard - using weeks and day offsets rather than specific dates.
object
仅过程化风格：由 date_create() 返回的 DateTime 类型的对象。此函数会修改这个对象。
year
Year of the date.
week
Week of the date.
day
Offset from the first day of the week.
返回被修改的 DateTime 对象， 或者在失败时返回 FALSE.
| 版本 | 说明 |
|---|---|
| 5.3.0 | 将返回值从NULL改为 DateTime 类型。 |
Example #1 DateTime::setISODate() example
面向对象风格
<?php
$date = new DateTime();
$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
Example #2 Values exceeding ranges are added to their parent values
<?php
$date = new DateTime();
$date->setISODate(2008, 2, 7);
echo $date->format('Y-m-d') . "\n";
$date->setISODate(2008, 2, 8);
echo $date->format('Y-m-d') . "\n";
$date->setISODate(2008, 53, 7);
echo $date->format('Y-m-d') . "\n";
?>
以上例程会输出：
2008-01-13 2008-01-14 2009-01-04
Example #3 Finding the month a week is in
<?php
$date = new DateTime();
$date->setISODate(2008, 14);
echo $date->format('n');
?>
以上例程会输出：
3