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DateTimeImmutable::modify

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

DateTimeImmutable::modifyCreates a new object with modified timestamp

说明

public DateTimeImmutable::modify(string $modifier): DateTimeImmutable|false

Creates a new DateTimeImmutable object with modified timestamp. The original object is not modified.

参数

modifier

日期/时间字符串。正确格式的说明详见 日期与时间格式

返回值

Returns a new modified DateTimeImmutable object 或者在失败时返回 false.

错误/异常

If an invalid Date/Time string is passed, DateMalformedStringException is thrown. Previous to PHP 8.3, this was a warning.

更新日志

版本 说明
8.3.0 Now throws DateMalformedStringException if an invalid string is passed, instead of a warning.

示例

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

参见

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