Newsgroups: php.internals
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Date: Sat, 22 Nov 2025 12:42:39 +0100 (CET)
To: Edmond Dantes <edmond.ht@gmail.com>
Cc: internals@lists.php.net
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Subject: Re: [PHP-DEV] [VOTE] True Async RFC 1.6
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From: mails@thomasbley.de (Thomas Bley)


> Edmond Dantes <edmond.ht@gmail.com> hat am 22.11.2025 11:37 CET geschrie=
ben:
>=20
> =20
> Hello
>=20
> > I expect that's already a good improvement for many use cases to read =
multiple files in parallel, run multiple queries in parallel, etc.
>=20
> I see. You want to get several promises to wait for?
> Then there is a good way to do it without additional functions:
>=20
> ```php
> $promise1 =3D spawn(file_get_content(...), "file1.txt");
> $promise2 =3D spawn(file_get_content(...), "file2.txt");
> $promise3 =3D spawn(file_get_content(...), "file3.txt");
> ```
>=20
> This is equivalent because a coroutine is a Future. In the same way,
> you can turn any other function into a Promise without creating a
> separate API.
>=20
> There is a nuance regarding resources. And in certain scenarios,
> creating an array of Promises in another way can save memory. For
> example, a scenario where you need to handle a large array of sockets.
> Such cases require a special API.
>=20
> ---
> Ed

Hello,

function return types should not depend on the outside context (spawn, hoo=
k, ini, etc.) because when the code gets more complex, it's very hard to f=
ind the outside context.

So file_get_contents() should always return string|false, file_get_content=
s_async() should always return a promise object.

=46rom the example I would expect it like this:

$promise1 =3D file_get_content_async("file1.txt");
$promise2 =3D file_get_content_async("file2.txt");
$promise3 =3D file_get_content_async("file3.txt");

// do sth else

$content1 =3D $promise->await();
$content2 =3D $promise->await();
$content3 =3D $promise->await();

PHP got very successful by making things easier than in C, this should be =
the path to continue.

Best Regards
Thomas