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Date: Wed, 14 May 2025 23:53:28 +0100
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Subject: Re: [PHP-DEV] Module or Class Visibility, Season 2
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From: imsop.php@rwec.co.uk ("Rowan Tommins [IMSoP]")



On 14 May 2025 21:50:25 BST, Michael Morris <tendoaki@gmail=2Ecom> wrote:
>Container, module, block, package, plugin, domain, division, fraction,
>lump, branch, sliver, splinter, constituent or whatever the hell else you
>call it, I don't care=2E

I know you think I'm just being pedantic about names, but=20
what I was trying to get across was the distinction between different feat=
ures that we could have both of, because they're solving separate problems=
=2E

It's basically about where the dividing line is=2E If you want this hierar=
chy of dependencies:=20

           +-- Plugin1 -- AcmeSDK v2 -- Guzzle v5
App --+
           +-- Plugin2 -- AcmeSDK v1 -- Guzzle v4

The requirement is not to hide Guzzle from Plugin1 - maybe it *needs* to c=
reate an object from Guzzle and pass it into AcmeSDK=2E

Instead, the requirement is for Plugin1 to hide both AcmeSDK *and* Guzzle =
from Plugin2=2E You don't want 7 different "things" (whatever you want to c=
all them) in that diagram, you want 3 (App, Plugin1-and- recursive-dependen=
cies, Plugin2-and- recursive-dependencies)=2E

The Linux container analogy is something like this:=20

           +-- container { WordPress -- PHP -- Apache }
Host --+
           +-- container { MediaWiki -- PHP -- Apache }

The goal of containers isn't to hide WordPress from Apache or vice versa, =
it's to hide the two copies of Apache and PHP from each other=2E There are =
plenty of things hidden *inside* Apache (the equivalent of "private classes=
") but that's a completely separate concept=2E

I wasn't saying the feature had to be called "containers", just that the a=
nalogy might be useful=2E

Rowan Tommins
[IMSoP]