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@ 2017-07-12T09:41:06Z

<?php

class ContractVersion
{
    private $end_date;

    public function __construct(\DateTime $end_date)
    {
        $this->end_date = $end_date;
    }

    public function getEndDate(): \DateTime
    {
        return clone $this->end_date;
    }
}

class VersionedContract
{
    private $versions = [];

    public function __construct(\DateTime $end_date)
    {
        $this->versions[] = new ContractVersion($end_date);
    }

    public function getEndDate(): \DateTime
    {
        return $this->getCurrentVersion()->getEndDate();
    }

    private function getCurrentVersion(): ContractVersion
    {
        return end($this->versions);
    }

    public function renew(\DateInterval $interval)
    {
        $this->versions[] = new ContractVersion($this->getEndDate()->add($interval));
    }
}

$contract = new VersionedContract(new \DateTime('2017-10-10 10:10:00'));

var_dump($contract->getEndDate()); // string(26) "2017-10-10 10:10:00.000000"
$endDate = $contract->getEndDate();

var_dump($endDate); // same string(26) "2017-10-10 10:10:00.000000"

$endDate->add(new \DateInterval('P1Y'));

var_dump($endDate);

Output for git.master, git.master_jit, rfc.property-hooks: object(DateTime)#4 (3) { ["date"]=> string(26) "2017-10-10 10:10:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTime)#4 (3) { ["date"]=> string(26) "2017-10-10 10:10:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } object(DateTime)#4 (3) { ["date"]=> string(26) "2018-10-10 10:10:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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