Re: [RFC] Allow "use( $longname as $alias)" syntax for closures declaration
| From: | John Bafford | Date: | Thu, 12 Apr 2012 17:42:36 +0000 |
| Subject: | Re: [RFC] Allow "use( $longname as $alias)" syntax for closures declaration | ||
| References: | 1 2 3 4 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-59801@lists.php.net to get a copy of this message | ||
On Apr 12, 2012, at 12:21, Nikita Popov wrote:
> On Thu, Apr 12, 2012 at 6:06 PM, Laruence <laruence@php.net> wrote:
>> On Fri, Apr 13, 2012 at 12:04 AM, Dmitri Snytkine
>> <dsnytkine@ultralogistics.com> wrote:
>>> I'm curious to know the benefits of this.
>>> Care to explain why or when this would be useful?
>
> It would be nice to see a few real-life scenarios where this is
> useful. Right now I can't think of situations where you'd want to
> change the variable name between the outer scope and the closure
> scope. Wouldn't that just be confusion for the programmer if the same
> variable would go under two different names?
How about something like this:
function f() {
…
$longButDescriptiveVariableUsedForSeveralThings = …;
...
usort($arr, function($a, $b) uses($longButDescriptiveVariableUsedForSeveralThings as $sortKey){
return $b->$sortKey - $a->$sortKey;
});
}
Function parameters are named such that they're relevant to the function, not the caller.
Closure variables should be seen as a (special case of) function parameter in that respect.
-John
--
John Bafford
http://bafford.com/