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Date: Tue, 11 Apr 2023 14:14:45 +0100
To: Dan Ackroyd <Danack@basereality.com>
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Subject: =?US-ASCII?Q?Re=3A_=5BPHP-DEV=5D_=5BRFC=5D_New_core_autoloading_mec?= =?US-ASCII?Q?hanism_with_support_for_function_autoloading?=
From: rowan.collins@gmail.com (Rowan Tommins)

On 11 April 2023 13:01:08 BST, Dan Ackroyd <Danack@basereality=2Ecom> wrote=
:
>On Tue, 11 Apr 2023 at 09:48, Rowan Tommins <rowan=2Ecollins@gmail=2Ecom>=
 wrote:
>>
>> Similarly, I think it should be possible to "unpin" a function
>> lookup with a later definition,
>
>Can you say what the technical justification for that is?


Perhaps "should" is too strong, but I would find it surprising if *using* =
a global function made it impossible to *define* a namespaced one=2E

As I said in my previous message, there is a fundamental difference betwee=
n caching of unprefixed name lookups, and actual function definitions=2E Th=
e current fallback and caching can always be skipped by using a fully quali=
fied name=2E

If additional caching is achieved using a dummy entry in the function tabl=
e, a real entry for that function should be able to evict it, so that a ful=
ly-qualified function name can still be used=2E


>Lots of things are possible, but I'd strongly prefer to have that be a
>separate discussion, which it's listed as a future scope:
>https://wiki=2Ephp=2Enet/rfc/core-autoloading#higher_performance_through_=
maps
>
>If nothing else, it's going to take people time to figure out how they
>are going to organise code that is 'just' a bunch of functions=2E


I'm not talking about full mapping from name to file, or about functions s=
pecifically, but about a lot of existing autoloaders beginning with boilerp=
late like "if ( ! str_starts_with('Acme\\Foo\\') ) { return; }", and then w=
hatever logic is used for loading Acme\Foo classes=2E If the core implement=
ation can perform that check, it can skip the context switch to userland co=
de=2E

That's a benefit to the class autoloading anyway, but I'd be very surprise=
d if function autoloaders looked any different, because that separation of =
ownership is pretty much what namespaces are *for*=2E


Regards,

--=20
Rowan Tommins
[IMSoP]