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Date: Sat, 22 Nov 2025 13:12:53 +0100 (CET)
To: Edmond Dantes <edmond.ht@gmail.com>
Cc: internals@lists.php.net
Message-ID: <980296152.1071.1763813573083@email.ionos.de>
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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 13:01 CET geschrieb=
en:
>=20
> =20
> Hello
>=20
> > function return types should not depend on the outside context (spawn, =
hook, ini, etc.) because when the code gets more complex, it's very hard to=
 find the outside context.
>=20
> What does =E2=80=9Coutside context=E2=80=9D mean?
>=20
> I just want to understand the practical use of functions with Promise.
> The code above makes sense only if there is awaitAll.
>=20
> $promise1 =3D file_get_content_async("file1.txt");
> $promise2 =3D file_get_content_async("file2.txt");
> $promise3 =3D file_get_content_async("file3.txt");
>=20
> awaitAll($promise1, ....);
>=20
> But you can achieve exactly the same effect without special functions.
> The only difference is that the _async function inside might be
> optimized in some way.
> Or is there something else?
>=20
> ---
> Ed

Hello,

basically in $result =3D foo(spawn(bar(baz(file_get_contents())))); file_ge=
t_contents() receives outside context from spawn() to turn into async mode.=
 Also foo(), bar(), baz() can be in different namespaces, different classes=
, so by looking at the code calling file_get_contents(), it's not clear if =
the result is sync or async.

Another example:

$foo =3D file_get_contents('foo.txt');
$result =3D foo($foo);

should be equal to:

$result =3D foo(file_get_contents('foo.txt'));


but having:

$foo =3D file_get_contents('foo.txt'); // sync
$result =3D spawn($foo); // error because $foo is string

would not be eqaul to:

$result =3D spawn(file_get_contents('foo.txt')); // async

Best Regards
Thomas