On 2011-04-07, Rasmus Lerdorf <ras...@lerdorf.com> wrote:
> On 4/7/11 2:30 PM, Rafael Dohms wrote:
> > On Thu, Mar 31, 2011 at 7:46 PM, Ben Schmidt
> > <mail_ben_schm...@yahoo.com.au> wrote:
> > > On 1/04/11 3:29 AM, David Coallier wrote:
> > > > 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 $var may not be set, but that you've accounted for that
> > > fact, so don't want a notice about it. Obviously the isset() can only be
> > > applied if the 'left hand side' is an lval, but I think it makes sense
> > > to apply it whenever it is an lval.
> > >
> > > So a big +1 from me.
> > >
> > > Ben.
> > >
> >
> > Its also a +1 for me, it would make the ternary operator much more
> > useful to me e remove lots of verbose code for handling arrays.
>
> Well, it would change the semantics. And Ben, no, it isn't shorthand for
> an isset() it is like writing (boolean)$var?$var:$something
It may change the semantics as they stand, but I'd argue that the
_expectation_ from the shorthand ternary is to shorten code that
currently uses isset(). As it is, I have almost no use for it at this
point, as I end up needing to do:
$value = isset($a[$key]) ? $a[$key] : 'Not set';
which is exactly the situation I had before it was introduced.
--
Matthew Weier O'Phinney
Project Lead | matt...@zend.com
Zend Framework | http://framework.zend.com/
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