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Date: Tue, 11 Feb 2020 15:48:18 +0100
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To: Nikita Popov <nikita.ppv@gmail.com>
Cc: Nicolas Grekas <nicolas.grekas+php@gmail.com>, Diogo Galvao <diogo86@gmail.com>, 
	PHP Internals List <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [RFC]
From: manuelcanga@gmail.com (Manuel Canga)

On Tue, 11 Feb 2020 at 14:19, Nikita Popov <nikita.ppv@gmail.com> wrote:
>
> On Tue, Feb 11, 2020 at 1:43 PM Manuel Canga <manuelcanga@gmail.com> wrot=
e:
>>
>> On Tue, 11 Feb 2020 at 13:16, Nicolas Grekas
>> <nicolas.grekas+php@gmail.com> wrote:
>> >
>> >
>> >
>> > Le mar. 11 f=C3=A9vr. 2020 =C3=A0 12:52, Diogo Galvao <diogo86@gmail.c=
om> a =C3=A9crit :
>> >>
>> >> On Tue, Feb 11, 2020 at 8:14 AM Manuel Canga <manuelcanga@gmail.com> =
wrote:
>> >> >
>> >> > Hi internals,
>> >> > I Would like to present a possible new "::func resolution" for your
>> >> > consideration.
>> >> ...
>> >> > use function \My\I18N\i18n_translate;
>> >> >
>> >> > $mapped_array =3D array_map(i18n_translate::func, $array);
>> >> ...
>> >> > What is your opinion ? Do you see it useful ?
>> >>
>> >> I've wished for this on many occasions and think it'd be really usefu=
l, as long
>> >> as it could work with methods as well:
>> >>
>> >> $mapped_array =3D array_map(I18N::translate::function, $array);
>> >>
>> >> For what it's worth I guess it could just return [I18N::class, 'trans=
late'].
>> >
>> >
>> > I wish this would return a Closure instead, making $foo::function the =
equivalent of Closure::fromCallable($foo).
>>
>> Hi, Nicolas,
>>
>> Currently, when <class_name>::class is used, class with <class_name>
>> can or cannot exists in that moment.
>> Using <function_name>::func( or <function_name>::function ), I think
>> should keep the same behavior.
>>
>> Using ::func as alias of "Closure::fromCallable" check if function
>> exists in that moment. It is certainly useful, but, I think it's more
>> important be consistent
>
>
> Checking whether the function exists is really unavoidable for functions,=
 because you don't know whether
>
> namespace Foo;
> var_dump(strlen::function);
>
> refers to 'Foo\strlen' or 'strlen', without first trying to look up the f=
ormer.
>
> I agree with Nicolas that this kind of feature would provide the most val=
ue if it created a Closure. This would circumvent all the issues outlined i=
n https://wiki.php.net/rfc/consistent_callables.
>
> Regards,
> Nikita

Thanks, Nikita. I don't know that RFC.

In that case, why don't use ::callable ?. This will be useful for
functions and others callable. E.g:

enqueue_task([I18n::class, 'translate']::callable);
enqueue_task(translate::callable);

Would it be hard to implement in PHP ?