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@ 2013-08-13T09:38:31Z

<?php
class MyDateTime extends \DateTime
{
    public function add($interval)
    {
        $oldDay = (int)$this->format('d');
        $this->setDate((int)$this->format('Y'), (int)$this->format('m'), 1);
        parent::add($interval);
        $maxDay = (int)$this->format('t');
        if($oldDay > $maxDay){
            $this->setDate((int)$this->format('Y'), (int)$this->format('m'), $maxDay);
        } else {
            $this->setDate((int)$this->format('Y'), (int)$this->format('m'), $oldDay);
        }
        return $this;
    }

    public function sub($interval)
    {
        $oldDay = (int)$this->format('d');
        $this->setDate((int)$this->format('Y'), (int)$this->format('m'), 1);
        parent::sub($interval);
        $maxDay = (int)$this->format('t');
        if($oldDay > $maxDay){
            $this->setDate((int)$this->format('Y'), (int)$this->format('m'), $maxDay);
        } else {
            $this->setDate((int)$this->format('Y'), (int)$this->format('m'), $oldDay);
        }
        return $this;
    }
}

$myDateTime = new MyDateTime('30th November 2000');
$interval = new \DateInterval('P3M');
var_dump($myDateTime->add($interval));

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Return type of MyDateTime::add($interval) should either be compatible with DateTime::add(DateInterval $interval): DateTime, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/MU8WF on line 4 Deprecated: Return type of MyDateTime::sub($interval) should either be compatible with DateTime::sub(DateInterval $interval): DateTime, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/MU8WF on line 18 object(MyDateTime)#1 (3) { ["date"]=> string(26) "2001-02-28 00:00:00.000000" ["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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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