Req #71520 [Opn]: Adding the DateTime constants to the DateTimeInterface interface

Edit report at https://bugs.php.net/bug.php?id=71520&edit=1 ID: 71520 User updated by: nyamsprod at gmail dot com Reported by: nyamsprod at gmail dot com Summary: Adding the DateTime constants to the DateTimeInterface interface Status: Open Type: Feature/Change Request Package: Date/time related Operating System: Irrelevant PHP Version: Irrelevant Block user comment: N Private report: N New Comment: Another argument in favor of this move is to forbidden constant value override in DateTimeInterface object subclasses https://3v4l.org/iZEks Previous Comments: ------------------------------------------------------------------------ [2016-02-04 10:14:22] nyamsprod at gmail dot com I'm suggesting to have them on the DateTimeInterface because: - they are used by the DateTimeInterface::format method - they are defined in RFCs that won't change during the lifetime of any implementing class - DateTimeImmutable is supposed to be the immutable replica of DateTime so that one could completely remove any reference to DateTime in his/her codebase when migrating from DateTime to DateTimeImmutable. ------------------------------------------------------------------------ [2016-02-04 09:33:40] requinix@php.net They aren't missing. The constants are on the DateTime class. Why should they be copied onto DateTimeImmutable? What's wrong with keeping them on DateTime? ------------------------------------------------------------------------ [2016-02-04 09:25:51] nyamsprod at gmail dot com Description: ------------ Currently it's not possible to access DateTime constants directly from DateTimeImmutable. Test script: --------------- $datetime = new DateTimeImmutable('2000-01-01 00:00:00', new DateTimeZone('Africa/Kinshasa')); var_dump($datetime->format(DateTimeImmutable::ATOM)); var_dump($datetime->format(DateTimeImmutable::COOKIE)); var_dump($datetime->format(DateTimeImmutable::ISO8601)); var_dump($datetime->format(DateTimeImmutable::RFC822)); var_dump($datetime->format(DateTimeImmutable::RFC850)); var_dump($datetime->format(DateTimeImmutable::RFC1036)); var_dump($datetime->format(DateTimeImmutable::RFC2822)); var_dump($datetime->format(DateTimeImmutable::RFC3339)); var_dump($datetime->format(DateTimeImmutable::RSS)); var_dump($datetime->format(DateTimeImmutable::W3C)); Expected result: ---------------- string(25) "2000-01-01T00:00:00+01:00" string(34) "Saturday, 01-Jan-2000 00:00:00 WAT" string(24) "2000-01-01T00:00:00+0100" string(29) "Sat, 01 Jan 00 00:00:00 +0100" string(32) "Saturday, 01-Jan-00 00:00:00 WAT" string(29) "Sat, 01 Jan 00 00:00:00 +0100" string(31) "Sat, 01 Jan 2000 00:00:00 +0100" string(25) "2000-01-01T00:00:00+01:00" string(31) "Sat, 01 Jan 2000 00:00:00 +0100" string(25) "2000-01-01T00:00:00+01:00" Actual result: -------------- The following constant are missing on the DateTimeInterface interface DateTimeInterface::ATOM, DateTimeInterface::COOKIE, DateTimeInterface::ISO8601, DateTimeInterface::RFC822, DateTimeInterface::RFC850, DateTimeInterface::RFC1036, DateTimeInterface::RFC2822, DateTimeInterface::RFC3339, DateTimeInterface::RSS, DateTimeInterface::W3C ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=71520&edit=1