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Date: Fri, 01 Apr 2011 09:46:12 +1100
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To: David Coallier <davidc@php.net>
CC: internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Implicit isset/isempty check on short-ternary operator
From: mail_ben_schmidt@yahoo.com.au (Ben Schmidt)

On 1/04/11 3:29 AM, David Coallier wrote:
> Hey there,
>
> I've been working on a little patch that will allow variables ($1) in
> a short-ternary operation to go through an implicit isset
> (zend_do_isset_or_isempty) check so that the average use-case for the
> short-ternary operator doesn't yield in a notice whenever the first
> variable of the expression isn't set.
>
> So the use-case I'm considering is the following:
>
> <?php
>      $list = array('name' =>  'list');
>
>      echo $list['name'] ?: 'List not set.' . PHP_EOL;
>      echo $list['name-notset'] ?: 'List not set.' . PHP_EOL;
> ?>
>
> This example, which we all know, will result in a notice for the
> second echo statement because the requested array-key doesn't actually
> exist in the array.

I'm not familiar with the construct, but to be honest, I fail to see how
it is useful without the suppression of the notice. I mean, it's a
shorthand for isset($var)?$var:$something_else isn't it? That
presupposes that $var may not be set, but that you've accounted for that
fact, so don't want a notice about it. Obviously the isset() can only be
applied if the 'left hand side' is an lval, but I think it makes sense
to apply it whenever it is an lval.

So a big +1 from me.

Ben.