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Date: Thu, 7 Nov 2013 14:10:11 +0100
Cc: List PHP Mailing List <internals@lists.php.net>,
  Dmitry Stogov <dmitry@zend.com>
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To: Bob Weinand <bobwei9@hotmail.com>
Subject: Re: [PHP-DEV] [RFC] Constant Scalar Expressions (with constants)
From: lars@strojny.net (Lars Strojny)

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Hi Bob,

alright, my fault not getting the ternary operator example :)

Thanks for the clarification!
Lars

On 07 Nov 2013, at 13:45, Bob Weinand <bobwei9@hotmail.com> wrote:

> Hi Lars,
>=20
> In what way is this ambiguous?
>=20
> I just tested; FOO never equals self::FOO. FOO always is a global =
constant, while self::FOO (and Klass::FOO) is the only way to refer to =
the class constant.
>=20
> const FOO =3D 2;
>=20
> class Klass
> {
>  const FOO =3D 1;
>  const BAR =3D FOO; // value two, global constant, and if FOO is not =
defined, Klass::Bar =3D=3D=3D "FOO".
> }
>=20
> Bob
>=20
> Am 7.11.2013 um 13:31 schrieb Lars Strojny <lars@strojny.net>:
>=20
>> Hi Bob,
>>=20
>> thanks for your work, it=92s awesome. One thing about constants:
>>=20
>> Take this example:
>>=20
>> const FOO =3D 2;
>>=20
>> class Klass
>> {
>>  const FOO =3D 1;
>>  const BAR =3D FOO;
>> }
>>=20
>> Here FOO is ambiguous, as it could resolve to 2 or to 1. If I =
understood it correctly, global constants are not yet implemented but I =
would suggest to always force prefixing the constant to get rid of the =
ambiguity and allow for future extension.
>>=20
>> const FOO =3D 2;
>>=20
>> class Klass
>> {
>>  const FOO =3D 1;
>>  const BAR =3D self::FOO;
>> }
>>=20
>> Does that make sense?
>>=20
>> cu,
>> Lars
>>=20
>> On 07 Nov 2013, at 13:01, Bob Weinand <bobwei9@hotmail.com> wrote:
>>=20
>>> Hi!
>>>=20
>>> As you all know, Anthony Ferrara had withdrawn his RFC a few months =
ago, which was without support for constants in these expressions:
>>>=20
>>> const foo =3D 10;
>>> const bar =3D 10 * foo;
>>>=20
>>> The use of a constant in a declaration of a constant was not yet =
possible with his patch.
>>>=20
>>> That's what I changed.
>>>=20
>>> Enjoy reading the RFC at:
>>>=20
>>> https://wiki.php.net/rfc/const_scalar_exprs
>>>=20
>>> Bob Weinand
>>>=20
>>> Special thanks go to Dmitry who had helped me a lot with feedback =
and a deep review of the patch.
>>> --
>>> PHP Internals - PHP Runtime Development Mailing List
>>> To unsubscribe, visit: http://www.php.net/unsub.php


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