Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:70403
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain gmail.com designates 74.125.82.180 as permitted sender)
MIME-Version: 1.0
Sender: ekneuss@gmail.com
In-Reply-To: <CAAjMSDPkyR1WMjMTMKcAoJSADBr+uA5t_9TAtpgLGnKD8BspoA@mail.gmail.com>
References: <CAAjMSDPkyR1WMjMTMKcAoJSADBr+uA5t_9TAtpgLGnKD8BspoA@mail.gmail.com>
Date: Tue, 26 Nov 2013 15:58:46 +0100
Message-ID: <CACQesk75JdUqTocQxpD9JKU02kBL7yvx7DqAYw11twDe7uEnYw@mail.gmail.com>
To: Chris London <me@chrislondon.co>
Cc: "internals@lists.php.net" <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=001a11c283b8d618cf04ec15b854
Subject: Re: [PHP-DEV] [Proposal] Modification to ?: functionality
From: colder@php.net (Etienne Kneuss)

--001a11c283b8d618cf04ec15b854
Content-Type: text/plain; charset=UTF-8

Hi Chris,




On Tue, Nov 26, 2013 at 3:43 PM, Chris London <me@chrislondon.co> wrote:

> I find in a lot of my code I have ternaries that set default values.  I
> also find that I can't use the ?: syntax for one reason and one reason
> only. It throws a notice if the value isn't set.
>
> I believe these two statements are functionally equivalent:
>
> $foo = $foo ? $foo : 'default';
>
> $foo = $foo ?: 'default';
>
> I would like to change it so it also checks for isset() so I propose the
> following would be functionally equivalent:
>
> $foo = isset($foo) && $foo ? $foo : 'default';
>
> $foo = $foo ?: 'default';
>
>

I would be happy to see a patch for that, last time I checked it was hard
to make the grammar happy with this change.

Note that it's not necessarily a variable. It should have no impact on:

$foo = gee() ?: "default";



> Random addition: what if we also allowed the following shorthand?
>
> $foo ?= 'default';
>
> or possibly:
>
> $foo ?:= 'default';
>
> Thanks everyone,
> Chris
>



-- 
Etienne Kneuss
http://www.colder.ch

--001a11c283b8d618cf04ec15b854--