php7 polyfill:
<?php
// keep timezone and microseconds precision
function polyfillDateTimeCreateFromInterface(DateTimeInterface $dti): DateTime {
$tz = $dti->getTimezone();
return new DateTime($dti->format('Y-m-d H:i:s.u'), $tz ? $tz : null);
}
?>
Testing:
<?php
var_dump(
($a = new DateTimeImmutable()),
($b = polyfillDateTimeCreateFromInterface($a)),
$a == $b
);
?>
DateTime::createFromInterface
(PHP 8)
DateTime::createFromInterface — Returns new DateTime object encapsulating the given DateTimeInterface object
说明
参数
-
object -
The DateTimeInterface object that needs to be converted to a mutable version. This object is not modified, but instead a new DateTime object is created containing the same date, time, and timezone information.
返回值
Returns a new DateTime instance.
示例
示例 #1 Creating a mutable date time object
<?php
$date = new DateTimeImmutable("2014-06-20 11:45 Europe/London");
$mutable = DateTime::createFromInterface($date);
$date = new DateTime("2014-06-20 11:45 Europe/London");
$also_mutable = DateTime::createFromInterface($date);
?>
add a note
User Contributed Notes 2 notes
gabrielpl at gmail dot com ¶
3 years ago
divinity76 at gmail dot com ¶
3 years ago
php7 polyfill:
<?php
// php7 polyfill for php8' DateTime::createFromInterface
function PolyfillDateTimeCreateFromInterface(DateTimeInterface $dti):DateTime{
$tz = $dti->getTimezone();
$ret = DateTime::createFromFormat(DateTimeInterface::RFC3339, $dti->format(DateTimeInterface::RFC3339));
if(!!$tz){
// without this: timezone +01:00
// with this: timezone Europe/Oslo
$ret = $ret->setTimezone($tz);
}
return $ret;
}
?>
testing it:
<?php
$dt = new DateTimeImmutable("1970-01-01",timezone_open("Europe/Oslo"));
$dti = PolyfillDateTimeCreateFromInterface($dt);
var_dump($dti->format(DateTime::RFC3339), $dti->getTimezone());
die();
?>
gives:
string(25) "1970-01-01T00:00:00+01:00"
object(DateTimeZone)#2 (2) {
["timezone_type"]=>
int(3)
["timezone"]=>
string(11) "Europe/Oslo"
}
- and warning: using the TimeZone argument of the DateTime constructor is a trap, in the example above if i used the constructor argument instead of setTimezone(), it would become "timezone_type=>1 timezone=>+01:00" instead of "timezone=>europe/oslo", the actual timezone name would be lost.
