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Date: Fri, 8 Apr 2011 11:12:10 +0200
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To: Adam Richardson <simpleshot@gmail.com>, internals@lists.php.net
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Subject: Re: [PHP-DEV] Implicit isset/isempty check on short-ternary operator
From: landeholm@gmail.com (Hannes Landeholm)

Hi. I like Adam's suggestion _a lot_ however I'd also find a third
case very useful.

In addition to:
*********
// standard
$value =3D isset($a[$key]) ? $a[$key] : 'Not set';

// new ?? double ternary that performs isset check and omits second
expression
$value =3D $a[$key] ?? : 'Not set';

// new ?? double ternary that performs isset check and uses second
expression
$value =3D $a[$key] ?? strtoupper($a[$key]) : 'Not set';
*********

I would also like a case where you could:

// new ?? double ternary that performs isset check and uses null
$value =3D $a[$key]??;

This would replace a lot of ugly code I have where: (the @ operator is ugly=
)

$value =3D @$a[$key];

When I want to treat all non existing indexes as containing the null value.

~Hannes


On 8 April 2011 09:02, Adam Richardson <simpleshot@gmail.com> wrote:
>
> >
> >
> >> =A0We need to be careful about changing the beahviour of existing
> > operators.
> >
>
> Indeed.
>
> The '?' character already is special, so using '??' seems like a safe,
> practical approach. However, I'd prefer maintaining the form of the stand=
ard
> ternary operator with the colon ($value =3D $var['bar'] ?? : 'Bar was not
> set'; // value =3D"Bar was not) so the '??' operator could be applied in =
any
> situation that one would normally use the standard ternary operator.
>
> // standard
> $value =3D isset($a[$key]) ? $a[$key] : 'Not set';
>
> // new ?? double ternary that performs isset check and omits second
> expression
> $value =3D $a[$key] ?? : 'Not set';
>
> // new ?? double ternary that performs isset check and uses second
> expression
> $value =3D $a[$key] ?? strtoupper($a[$key]) : 'Not set';
>
> Granted, the last example might be infrequent, but I think there's also a
> value in keeping the form of the double ternary (if used at all) the same=
 as
> the standard ternary operator for consistency sake.
>
> Adam
>
> --
> Nephtali: =A0A simple, flexible, fast, and security-focused PHP framework
> http://nephtaliproject.com