DateTimeImmutable::createFromInterface

(PHP 8)

DateTimeImmutable::createFromInterface — Returns new DateTimeImmutable object encapsulating the given DateTimeInterface object

说明

public static DateTimeImmutable::createFromInterface ( DateTimeInterface $object ) : DateTimeImmutable

参数

object

The DateTimeInterface object that needs to be converted to an immutable version. This object is not modified, but instead a new DateTimeImmutable object is created containing the same date, time, and timezone information.

返回值

Returns a new DateTimeImmutable instance.

范例

Example #1 Creating an immutable date time object

<?php
$date = new DateTime("2014-06-20 11:45 Europe/London");

$immutable = DateTimeImmutable::createFromInterface($date);

$date = new DateTimeImmutable("2014-06-20 11:45 Europe/London");
$also_immutable = DateTimeImmutable::createFromInterface($date);
?>

User Contributed Notes

divinity76 at gmail dot com 07-Jul-2021 11:12
php7 polyfill:
<?php
function PolyfillDateTimeImmutableCreateFromInterface(DateTimeInterface $dti):DateTimeImmutable{
    $tz = $dti->getTimezone();
    $ret = DateTimeImmutable::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 DateTime("1970-01-01",timezone_open("Europe/Oslo"));
$dti = PolyfillDateTimeImmutableCreateFromInterface($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 DateTimeImmutable 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 timezone name would be lost.