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Date: Mon, 02 Jun 2025 15:44:24 +0100
To: php internals <internals@lists.php.net>
Subject: Re: [PHP-DEV] Module or Class Visibility, Season 2
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From: imsop.php@rwec.co.uk ("Rowan Tommins [IMSoP]")



On 2 June 2025 14:27:45 BST, Larry Garfield <larry@garfieldtech=2Ecom> wro=
te:
>Were we to do that, then the consumer container-loading needs to take any=
 potential module-definition into account=2E  Eg, if one class from a modul=
e is pulled into a container, all of them must be=2E

You wouldn't containerize "something from a library", any more than you co=
ntainerize "part of Nginx"=2E You create a container, and put a bunch of st=
uff in it *that doesn't know it's running in a container*=2E A Linux contai=
ner doesn't know that Nginx requires a bunch of shared libraries and daemon=
s, it just creates a file system and a process tree, and lets you do what y=
ou like with them=2E

Let's say I'm writing a WordPress plugin=2E It's just a bunch of files on =
disk, some of which I've written, some of which I've obtained from open sou=
rce projects=2E Maybe there's a giant file with lots of classes in, a vendo=
r directory I've generated using Composer, some Phar files, and some fancy =
modules with metadata files=2E Maybe I distribute an install script that fe=
tches updated versions of all those things; maybe I just stick the whole th=
ing in a tar file and host it on my website=2E

I want to have WordPress load all that code as part of my plugin, and not =
complain that somewhere in there I've called a class Monolog\Logger, and th=
at name is already used=2E

I don't need WordPress, or PHP, to know whether that class is "really" a v=
ersion of Monolog, or how it ended up in the folder=2E And I don't need twe=
nty different containers for all the different things in the folder=2E I ju=
st need to put *that whole folder* into a single container, to separate it =
from someone else's plugin=2E

The container somehow creates a new namespace root, like a Linux container=
 creates a new file system root=2E The code inside uses require, autoloadin=
g, module definitions, etc etc, but can't escape the container=2E=20

Then in some way, I define what's allowed to cross the boundary between th=
e main application and this container - e=2Eg=2E what parts of the WordPres=
s API need to be visible inside the container, and what parts of the contai=
ner need to be called back from WordPress=2E

And that, if it's possible at all, is the plugin use case sorted=2E No cha=
nges to Composer, no need to rewrite every single PHP package ever written=
=2E Probably some caveats where dynamic code can accidentally escape the co=
ntainer=2E Completely separate from the kind of "module" you and Arnaud wer=
e experimenting with=2E

Rowan Tommins
[IMSoP]