Req #75195 [Opn]: DateTimeInterface does not include add method

Edit report at https://bugs.php.net/bug.php?id=75195&edit=1 ID: 75195 User updated by: richard dot carree dot com at gmail dot com Reported by: richard dot carree dot com at gmail dot com Summary: DateTimeInterface does not include add method Status: Open Type: Feature/Change Request Package: Date/time related PHP Version: Irrelevant Block user comment: N Private report: N New Comment: Both return an object that implements DateTimeInterface. Couldn't we have something like the following? ``` /** * @return \DateTimeInterface */ public function add(DateInterval $interval); ``` Previous Comments: ------------------------------------------------------------------------ [2017-09-29 09:05:38] heiglandreas@php.net I wouldn't want to have it included in the interface as the implementation between both is different. Datetime returns itself, while DateTimeImmutable returns a new instance of Datetimeimmutable. So technically the return value is not the same… ------------------------------------------------------------------------ [2017-09-12 17:08:01] richard dot carree dot com at gmail dot com Sorry, I meant: Both of DateTime and DateTimeImmutable expose add method. As "DateTimeInterface is meant so that both DateTime and DateTimeImmutable can be type hinted for", why it does not include add method? ------------------------------------------------------------------------ [2017-09-12 17:06:10] richard dot carree dot com at gmail dot com Description: ------------ Both of DateTime and DateTimeInterface expose add method. As "DateTimeInterface is meant so that both DateTime and DateTimeImmutable can be type hinted for", why it does not include add method? ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=75195&edit=1