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Date: Tue, 6 Apr 2021 12:11:05 +0700
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References: <php.internals-113545@news.php.net>
To: Mark Randall <marandall@php.net>
Subject: Re: [PHP-DEV] [RFC] Autoloader Classmap
From: php-lists@koalephant.com (Stephen Reay)



> On 6 Apr 2021, at 05:05, Mark Randall <marandall@php.net> wrote:
>=20
> On 15/03/2021 17:41, Mark Randall wrote:
>> I would like to propose the addition of a new mechanism of =
autoloading classes - a classmap that will be consulted prior to =
checking the spl_autoload_register'd callbacks.
>> https://wiki.php.net/rfc/autoload_classmap
>=20
> Does anyone else have any more feedback on this? If not I plan on =
opening voting in a couple of weeks or so.
>=20
> The tl;dr:
>=20
> * Autoloading is one of the routines called most frequently in any =
request.
>=20
> * It's a very minor boost in autoloading performance, around 5% vs =
invoking a userland function. This will easily be swamped by any IO and =
invalidated entirely by preloading.
>=20
> * I expect 99.9999% of users will never know it exists, and it will =
instead just be an option for tools like composer that will provide a =
small transparent boost.
>=20
> * It provides a very minor benefit to debugging as you get to skip =
over the autoloading frames which so very often come up during a =
request.
>=20
>=20
> --=20
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>=20

Hi Mark,

Just to clarify something - wouldn't the loader use =E2=80=98require=E2=80=
=99 behaviour, not =E2=80=98require_once=E2=80=99 behaviour? If you=E2=80=99=
re hitting the autoloader, that means the class in the file you=E2=80=99re=
 about to load isn=E2=80=99t defined yet, which means the file hasn=E2=80=99=
t been loaded already. Using require_once you=E2=80=99d be doing a check =
if the file has loaded in a scenario where it would have never been =
loaded anyway.



Cheers

Stephen=20=