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@ 2018-03-14T08:23:50Z

<?php

class MyInterval extends DateInterval
{
    public static function instance(DateInterval $di)
    {
        $date = array_filter(array(
            'Y' => $di->y,
            'M' => $di->m,
            'D' => $di->d,
        ));

        $time = array_filter(array(
            'H' => $di->h,
            'M' => $di->i,
            'S' => $di->s,
        ));

        $specString = 'P';

        foreach ($date as $key => $value) {
            $specString .= $value.$key;
        }

        if (count($time) > 0) {
            $specString .= 'T';
            foreach ($time as $key => $value) {
                $specString .= $value.$key;
            }
        }

        return new static($specString === 'P' ? 'PT0S' : $specString);
    }
}

$diff = (new DateTime('yesterday'))->diff(new DateTime('tomorrow'));

$myDiff = MyInterval::instance($diff);

var_dump($myDiff);

Output for git.master, git.master_jit, rfc.property-hooks: object(MyInterval)#1 (10) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(2) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["f"]=> float(0) ["invert"]=> int(0) ["days"]=> bool(false) ["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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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