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Date: Tue, 26 Nov 2013 09:58:06 -0700
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To: Mats Lindh <mats.lindh@gmail.com>
Cc: "internals@lists.php.net" <internals@lists.php.net>
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Subject: Re: [PHP-DEV] [Proposal] Modification to ?: functionality
From: me@chrislondon.co (Chris London)

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On Tue, Nov 26, 2013 at 8:15 AM, Mats Lindh <mats.lindh@gmail.com> wrote:

> On Tue, Nov 26, 2013 at 3:43 PM, Chris London <me@chrislondon.co> wrote:
>
>> I believe these two statements are functionally equivalent:
>>
>> $foo = $foo ? $foo : 'default';
>>
>> $foo = $foo ?: 'default';
>>
>
> They are.
>
>
> 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';
>>
>
> The would break the assumption that a reference to an uninitialized value
> would generate a notice, unless explicitly handled in the logic.
>
> While I also would like to have something similar to ?: to handle default
> values for array keys, etc., this would change a fundamental assumption
> that as been in place for many years now. I'm not sure if that's a BC break
> that would be acceptable this late. An alternative operator may be more
> suitable.
>

What do you think about using:

$foo = $foo @: 'default';

and possibly

$foo @= 'default';



>
> The change proposed has also been discussed several times since the
> implementation of ?:. See the ifsetor-RFC:
>
> https://wiki.php.net/rfc/ifsetor
>
> It also contains links to the discussion around the feature back then.
>
> --mats
>

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