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@ 2021-07-27T03:41:03Z

<?php

date_default_timezone_set('UTC');
$begin = new \DateTime('2012-06-25');
$end = new \DateTime('2012-07-27');
$interval = $begin->diff($end);
$c = $interval;
$seconds = (($end->getTimestamp()) - ($begin->getTimestamp()));

// for DateTimeInterface::add()
$base = new \DateTimeImmutable('2012-07-02');
$end = new \DateTime('2012-08-03');
$interval = $base->diff($end);
$target = $base->add($interval);
$comparison = ((new \DateTime())->setTimestamp((($base->getTimestamp()) + $seconds)));
var_dump($target->format('Y-m-d'));
var_dump($comparison->format('Y-m-d'));

// for DateTimeInterval::sub()
$base = new \DateTimeImmutable('2012-08-03');
$target = $base->sub($interval);
$comparison = (new \DateTime())->setTimestamp($base->getTimestamp() - $seconds);
var_dump($target->format('Y-m-d'));
var_dump($comparison->format('Y-m-d'));
var_dump($seconds, $interval, $c);

Output for git.master, git.master_jit, rfc.property-hooks: string(10) "2012-08-03" string(10) "2012-08-03" string(10) "2012-07-02" string(10) "2012-07-02" int(2764800) object(DateInterval)#2 (10) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(1) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["f"]=> float(0) ["invert"]=> int(0) ["days"]=> int(32) ["from_string"]=> bool(false) } object(DateInterval)#3 (10) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(2) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["f"]=> float(0) ["invert"]=> int(0) ["days"]=> int(32) ["from_string"]=> bool(false) }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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