(PHP 5 >= 5.5.0, PHP 7, PHP 8)
DateTimeImmutable::modify — Creates a new object with modified timestamp
Creates a new DateTimeImmutable object with modified timestamp. The original object is not modified.
modifier日期/时间字符串。正确格式的说明详见 日期与时间格式。
Returns a new modified DateTimeImmutable object 或者在失败时返回 false.
If an invalid Date/Time string is passed, DateMalformedStringException is thrown. Previous to PHP 8.3, this was a warning.
| 版本 | 说明 |
|---|---|
| 8.3.0 | Now throws DateMalformedStringException if an invalid string is passed, instead of a warning. |
示例 #1 DateTimeImmutable::modify() example
面向对象风格
<?php
$date = new DateTimeImmutable('2006-12-12');
$newDate = $date->modify('+1 day');
echo $newDate->format('Y-m-d');
?>以上示例会输出：
2006-12-13
示例 #2 Beware when adding or subtracting months
<?php
$date = new DateTimeImmutable('2000-12-31');
$newDate1 = $date->modify('+1 month');
echo $newDate1->format('Y-m-d') . "\n";
$newDate2 = $newDate1->modify('+1 month');
echo $newDate2->format('Y-m-d') . "\n";
?>以上示例会输出：
2001-01-31 2001-03-03