Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:101340
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain gmail.com designates 74.125.83.50 as permitted sender)
To: Nikita Popov <nikita.ppv@gmail.com>
Cc: PHP internals <internals@lists.php.net>
References: <CAF+90c_Ctjja=8fR-uBWL1wDxZge771yMujMhaR_R2seKXciYw@mail.gmail.com>
 <c31d2b02-220f-dda3-c232-564f94877dc1@gmail.com>
 <CAF+90c82gVkwMK11B__HuNoSUz3eHx1VmG5PoNu6yJuTAUO3fw@mail.gmail.com>
Message-ID: <88d391e8-a37b-1272-8915-e26668a6cfcc@gmail.com>
Date: Tue, 12 Dec 2017 15:14:34 -0800
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0)
 Gecko/20100101 Thunderbird/52.5.0
MIME-Version: 1.0
In-Reply-To: <CAF+90c82gVkwMK11B__HuNoSUz3eHx1VmG5PoNu6yJuTAUO3fw@mail.gmail.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Subject: Re: [PHP-DEV] [RFC] Namespace-scoped declares, again
From: smalyshev@gmail.com (Stanislav Malyshev)

Hi!

> There is no dependence on loading order. The implementation is careful
> to ensure that the used declare state is consistent. It's not possible
> to call namespace_declare() twice on the same namespace. It's not
> possible to first load some files from a namespace, do the
> namespace_declare() call and then load some more files. If a

This means that namespace_declare can be only in one file, and if any
mention of any namespace class has been made before that file has been
loaded, then the declare would fail. That is loading order dependency -
if A.php contains namespace_declare and B.php contains another class of
the same namespace, then order (A, B) works but order (B, A) does not.

> The big issue with ini settings is (mostly) not the "hidden" part, it's
> the "global" part. Ini settings that change language behavior are tabu

Exactly. And this proposal adds another global state, which is also
invisible, so figuring out what the state is when debugging is... fun.
It's better than php.ini as it's "namespaced php.ini" but still suffers
from the same problems within the namespace (and namespaces can be
pretty big).

> this. A library can namespace_declare() it's configuration and be sure
> that this is the configuration it's going to get, at the same time not
> interfering with any other library or code that uses a different
> configuration.

This assumes each namespace is homogeneous code always belonging to the
same library and nothing is every added to that namespace. This is not
always the case.

-- 
Stas Malyshev
smalyshev@gmail.com