Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:111114
Content-Type: text/plain;
	charset=us-ascii
Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.1\))
In-Reply-To: <CAFPFaM+MVVOd2ATWkEZQ_TVv2DwdbUP3zNkG_qh5f652CFkLZA@mail.gmail.com>
Date: Wed, 22 Jul 2020 15:20:38 +0200
Cc: PHP internals <internals@lists.php.net>
Content-Transfer-Encoding: quoted-printable
Message-ID: <5CC11248-EB38-4488-B847-15623BEF8BA6@cschneid.com>
References: <CAFPFaM+MVVOd2ATWkEZQ_TVv2DwdbUP3zNkG_qh5f652CFkLZA@mail.gmail.com>
To: "G. P. B." <george.banyard@gmail.com>
Subject: Re: [PHP-DEV] [RFC] [VOTE] Saner numeric strings
From: cschneid@cschneid.com (Christian Schneider)

Am 16.07.2020 um 16:18 schrieb G. P. B. <george.banyard@gmail.com>:
> I've opened voting for the Saner Numeric strings RFC:
> https://wiki.php.net/rfc/saner-numeric-strings

Looking at the BC section I stumbled across

> Code relying on the fact that '' (an empty string) evaluates to 0 for =
arithmetic/bitwise operations.


which is elaborated further down as

> The third reason already emitted an E_WARNING. We considered =
special-casing this to evaluate to 0, but this would be inconsistent =
with how type declarations deal with an empty string, namely throwing a =
TypeError. Therefore a TypeError will also be emitted in this case. The =
error can be avoided by explicitly checking for an empty string and =
changing it to 0.


but now I'm a bit confused what is meant by "arithmetic/bitwise =
operations".

I assume this applies only to things like substr("foo", "") but not to =
arithmetic *operators* like 42 + "" because that doesn't currently =
trigger E_WARNING AFAIK.
Maybe this should be clarified?

Regards,
- Chris