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Subject: Re: [PHP-DEV] [RFC] Context Managers
Date: Mon, 15 Dec 2025 22:08:33 -0600
References: <CAJp_myV9+kxx-eA+cja-Fu5dJhDZgzhgpBpiZFWqqW-_zrNreQ@mail.gmail.com>
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To: php internals <internals@lists.php.net>
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From: ben@benramsey.com (Ben Ramsey)

> On Dec 15, 2025, at 18:21, Deleu <deleugyn@gmail.com> wrote:
>=20
> On Mon, 15 Dec 2025 at 20:01 Ben Ramsey <ben@benramsey.com> wrote:
>>>=20
>>>=20
>>> Since the only feedback on what to use for "as" was that =3D> makes =
sense, we have changed the RFC to use =3D> instead.  So the new syntax =
is
>>>=20
>>> using (new CM() =3D> $cVar) {
>>>   // Do stuff here.
>>> }
>>>=20
>>> Going to be controversial here, but this is confusing, because it =
operates in the exact opposite of every other usage of =3D> we have. =
With associative arrays, the left is assigned to the expression on the =
right; with arrow functions, the return value is the expression on the =
right; with match, the expression on the right is returned.=20
>>>=20
>>> This is going to be easy to get wrong.=20
>>=20
>>=20
>> I agree with Matthew.
>>=20
>> I think it makes more sense to reverse them, like this:
>>=20
>>     using ($cVar =3D> new CM()) {
>>         // Do stuff here.
>>     }
>>=20
>> I think it=E2=80=99s still clear what this is doing, when reading it.
>>=20
>> Cheers,
>> Ben
>=20
> I also agree with Matthew but the reversed proposed here looks very =
very awkward to me. I think the most natural thing is the =E2=80=9Cas=E2=80=
=9D but I may have missed the discussion on why it had to be changed.=20
>=20
> Thinking of foreach ($array as $value), an item from the array (left) =
is assigned to $value (right). That seems symmetrical to using (new =
Manager as $manager) where the instance (left) is assigned to the =
variable (right). Also when using aliases on the top of the file =E2=80=9C=
use Foo as Bar;=E2=80=9D as is also assigning the left to the right.=20


This argument makes sense to me (i.e., using `as` instead of `=3D>`).

I=E2=80=99ll go back through the thread to find the arguments against =
using `as`, to understand why it changed to `=3D>`.

Cheers,
Ben