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- 日期/时间
- DateTimeImmutable
DateTimeImmutable::__construct
date_create_immutable
(PHP 5 >= 5.5.0, PHP 7, PHP 8)
DateTimeImmutable::__construct -- date_create_immutable — Returns new DateTimeImmutable object
说明
面向对象风格
public DateTimeImmutable::__construct(string$datetime = "now", ?DateTimeZone $timezone = null)
过程化风格
date_create_immutable(string$datetime = "now", ?DateTimeZone $timezone = null): DateTimeImmutable|false
Returns new a DateTimeImmutable object.
参数
-
datetime -
日期/时间字符串。正确格式的说明详见 日期与时间格式。
Enter
"now"here to obtain the current time when using the$timezoneparameter. -
timezone -
A DateTimeZone object representing the timezone of
$datetime.If
$timezoneis omitted ornull, the current timezone will be used.注意:
The
$timezoneparameter and the current timezone are ignored when the$datetimeparameter either is a UNIX timestamp (e.g.@946684800) or specifies a timezone (e.g.2010-01-28T15:00:00+02:00).
返回值
Returns a new DateTimeImmutable instance.
过程化风格在失败时返回 false。
错误／异常
Emits Exception in case of an error.
更新日志
| 版本 | 说明 |
|---|---|
| 7.1.0 | From now on microseconds are filled with actual value. Not with '00000'. |
范例
示例 #1 DateTimeImmutable::__construct() example
面向对象风格
<?php
try {
$date = new DateTimeImmutable('2000-01-01');
} catch (Exception $e) {
echo $e->getMessage();
exit(1);
}
echo $date->format('Y-m-d');
?>
过程化风格
<?php
$date = date_create('2000-01-01');
if (!$date) {
$e = date_get_last_errors();
foreach ($e['errors'] as $error) {
echo "$error\n";
}
exit(1);
}
echo date_format($date, 'Y-m-d');
?>
以上例程会输出：
2000-01-01
示例 #2 Intricacies of DateTimeImmutable::__construct()
<?php
// Specified date/time in your computer's time zone.
$date = new DateTimeImmutable('2000-01-01');
echo $date->format('Y-m-d H:i:sP') . "\n";
// Specified date/time in the specified time zone.
$date = new DateTimeImmutable('2000-01-01', new DateTimeImmutableZone('Pacific/Nauru'));
echo $date->format('Y-m-d H:i:sP') . "\n";
// Current date/time in your computer's time zone.
$date = new DateTimeImmutable();
echo $date->format('Y-m-d H:i:sP') . "\n";
// Current date/time in the specified time zone.
$date = new DateTimeImmutable(null, new DateTimeZone('Pacific/Nauru'));
echo $date->format('Y-m-d H:i:sP') . "\n";
// Using a UNIX timestamp. Notice the result is in the UTC time zone.
$date = new DateTimeImmutable('@946684800');
echo $date->format('Y-m-d H:i:sP') . "\n";
// Non-existent values roll over.
$date = new DateTimeImmutable('2000-02-30');
echo $date->format('Y-m-d H:i:sP') . "\n";
?>
以上例程的输出类似于：
2000-01-01 00:00:00-05:00 2000-01-01 00:00:00+12:00 2010-04-24 10:24:16-04:00 2010-04-25 02:24:16+12:00 2000-01-01 00:00:00+00:00 2000-03-01 00:00:00-05:00
User Contributed Notes 1 note
up down 2 wangbuying at gmail dot com ¶2 years ago
As the type of the first parameter is string, we can assign a relative date for it.
Example:
<?php
$immutable = new DateTimeImmutable('-1 year', new DateTimeZone('Asia/ShangHai'));
echo $immutable->format('Y-m-d H:i:s');
?>
It looks like the parameter of function strtotime and is very helpful for us to get an immutable relative DateTime object.
add a note
官方地址：https://www.php.net/manual/en/datetimeimmutable.construct.php