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Date: Sun, 18 Mar 2007 22:18:53 -0400
To: Stanislav Malyshev <stas@zend.com>
Subject: Re: [PHP-DEV] PATCH: anonymous functions in PHP
From: wez@omniti.com (Wez Furlong)

I didn't make it do anything fancy with scoping; it would make the  
implementation more complicated, and wouldn't fit so well with the  
way that scoping works in PHP, in that you need to explicitly  
reference the global scope to "break out" of your function scope.

It would be cool if the lexical scope was inherited, but maybe not  
cool enough to warrant making it work :)

--Wez.


On Mar 18, 2007, at 10:06 PM, Stanislav Malyshev wrote:

>> $data = array("zoo", "orange", "car", "lemon", "apple");
>> usort($data, function($a, $b) { return strcmp($a, $b); });
>> var_dump($data); # data is sorted alphabetically
>
> What happens if you do this:
>
> $data = array("zoo", "orange", "car", "lemon", "apple");
> $rev = 1;
> usort($data, function($a, $b) { return $rev?strcmp($a, $b):!strcmp 
> ($a, $b); });
> var_dump($data); # data is sorted alphabetically
>
> This works in Javascript (probably Ruby too), but quite hard to  
> make work in PHP because $rev is in different scope.
> Moreover, would it mean that this:
> $f = function($a, $b) { return $rev?strcmp($a, $b):!strcmp($a, $b); }
> would work too? Keeping right value of $rev?
> -- 
> Stanislav Malyshev, Zend Products Engineer
> stas@zend.com  http://www.zend.com/
>