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Bug #74982 strftime %P not working on Alpine Linux
Submitted: 2017-07-24 18:18 UTC Modified: 2021-04-07 16:36 UTC
From: ryan at ryanparman dot com Assigned: cmb (profile)
Status: Closed Package: Date/time related
PHP Version: 7.1.7 OS: Alpine Linux 3.4
Private report: No CVE-ID: None
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 [2017-07-24 18:18 UTC] ryan at ryanparman dot com 
Description:
------------
I'm using the official PHP Docker container "php:7.1.7-fpm-alpine", which is based on Alpine Linux 3.4.

https://github.com/docker-library/php/blob/ddc7084c8a78ea12f0cfdceff7d03c5a530b787e/7.1/fpm/alpine/Dockerfile

When using strftime() on Alpine Linux, the %P modifier does not appear to be supported. When used, the resulting value is (bool) false.

The documentation on http://php.net/strftime says:

> Mac OS X only: The %P modifier is not supported in the Mac OS X implementation of this function.

I would assume that the follow-up to this ticket would either be:

1. To update the documentation to explain that this modifier is unsupported on Alpine Linux in addition to macOS. And/or…

2. That this is a proper bug, and Alpine Linux support should be fixed at some point.


Test script:
---------------
https://gist.github.com/skyzyx/55e2dea4e7f8fbc6854b2c81f51e8cf9

Expected result:
----------------
I expect the result to be `string(7) "06:12pm"`.

Actual result:
--------------
The actual result is `bool(false)`.

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 [2017-07-24 19:10 UTC] danack@php.net 
I believe this is the source for strftime on musl libc which is the C library used in Alphine linux:

http://git.musl-libc.org/cgit/musl/tree/src/time/strftime.c?id=ac0acd569e01735fc6052d43fdf57f3a07c93f3d

It does not appear to support "%P", which would make this a documentation issue.
 [2018-02-28 22:11 UTC] cmb@php.net
-Package: Unknown/Other Function +Package: Date/time related
 [2021-04-07 16:36 UTC] cmb@php.net
-Status: Open +Status: Verified -Assigned To: +Assigned To: cmb
 [2021-04-07 16:36 UTC] cmb@php.net 
The documentation already mentions[1]:

| Not all conversion specifiers may be supported by your C
| library, in which case they will not be supported by PHP's
| strftime().

It shouldn't hurt to document that %P is not supported by musl,
though.

Note that there is an RFC[2] to deprecate strftime().

[1] <https://www.php.net/strftime>
[2] <https://wiki.php.net/rfc/deprecations_php_8_1>
 [2021-04-12 12:12 UTC] git@php.net 
Automatic comment on behalf of cmb69
Revision: https://github.com/php/doc-en/commit/6936064e733f39045f471aad492abdeed7c4d2c6
Log: Fix #74982: strftime %P not working on Alpine Linux
 [2021-04-12 12:12 UTC] git@php.net
-Status: Verified +Status: Closed
 [2021-04-14 18:12 UTC] git@php.net 
Automatic comment on behalf of mumumu
Revision: https://github.com/php/doc-ja/commit/2c7c178ce49d23b9c41518df99f5425cfa607dd7
Log: Fix #74982: strftime %P not working on Alpine Linux
 [2021-04-21 14:31 UTC] git@php.net 
Automatic comment on behalf of Girgias
Revision: https://github.com/php/doc-fr/commit/c7383407f375cd1e0b5fee8db33d7423c7f98806
Log: Fix #74982: strftime %P not working on Alpine Linux
 
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