Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:89344
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain gmail.com designates 209.85.220.49 as permitted sender)
Content-Type: text/plain; charset=utf-8
Mime-Version: 1.0 (Mac OS X Mail 9.0 \(3094\))
In-Reply-To: <20.F5.23339.A9822565@pb1.pair.com>
Date: Mon, 23 Nov 2015 11:51:12 -0800
Cc: PHP internals <internals@lists.php.net>
Content-Transfer-Encoding: quoted-printable
Message-ID: <F032E95B-CA63-4458-ACA6-9019AC1B8D29@gmail.com>
References: <4D5D4A6D-1E94-4893-B1DF-7A8C616C871A@gmail.com> <20.F5.23339.A9822565@pb1.pair.com>
To: Andrea Faulds <ajf@ajf.me>
Subject: Re: [PHP-DEV] PHP7 Coalesce operator
From: shadda@gmail.com (shadda)

Hey, thanks for responding.

However, I still think that misses the point, or at least the true =
utility of what I=E2=80=99m proposing.

In practice, you can ignore E_NOTICE and php will happily treat null and =
!isset() as the same thing in *most* cases, so that=E2=80=99s not a good =
indicator of truthiness.=20

Basically in ECMA, anything non-null, false, or undefined is true. PHP =
is very similar in that regard, but our reliance on E_NOTICE to (ahem) =
enforce isset() checks is why, I assume, we=E2=80=99re introducing the =
?? operator to begin with.=20

I just think it=E2=80=99d be nice to have a small variation on this =
feature that was less concerned with a (defined|null) semantic and more =
in keeping with PHP=E2=80=99s overall handling of implicit type =
conversion in expressions.=20

Does that make more sense?

> On Nov 22, 2015, at 12:41 PM, Andrea Faulds <ajf@ajf.me> wrote:
>=20
> Hi,
>=20
> shadda wrote:
>> I had a question-suggestion based around the cool new operator =
we=E2=80=99re getting in PHP7, the ?? operator, which as I understand it =
is the functional equivalent to perl=E2=80=99s // operator; in that they =
both test for whether or not a variable is defined, rather than it=E2=80=99=
s truthiness.
>=20
> This is not strictly correct. Though something of a misnomer, the =
'null coalesce operator' checks if a variable doesn't exist, but also =
that it is not null, i.e. it functions like isset().
>=20
> Thanks.
>=20
> --=20
> Andrea Faulds
> http://ajf.me/
>=20
> --=20
> PHP Internals - PHP Runtime Development Mailing List
> To unsubscribe, visit: http://www.php.net/unsub.php
>=20