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Date: Tue, 28 Oct 2008 16:00:20 +0200
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To: Lars Strojny <lstrojny@php.net>
CC: Andrei Zmievski <andrei@gravitonic.com>, =?UTF-8?B?Sm9oYW5uZXMgU2NobMO8?=
 =?UTF-8?B?dGVy?= <johannes@php.net>, 
 Alexey Zakhlestin <indeyets@gmail.com>,
 Mark van der Velden <mark@dynom.nl>, Stanislav Malyshev <stas@zend.com>, 
 PHP Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] array_key_exists BC break
From: ionut.g.stan@gmail.com (Ionut Gabriel Stan)

While we're at this and considering the new lambdas that we now have in 
the language
I must say I'd like some functions to support Traversables. Those would be:

array_map(), array_reduce(), array_filter(), array_walk() and 
array_walk_recursive()

Although I'd rather want a class (because the array_* functions don't 
adhere to some strict param order standards)
to provide functional style methods, like those in Javascript 1.8:

https://developer.mozilla.org/index.php?title=En/New_in_JavaScript_1.6#section_2
https://developer.mozilla.org/index.php?title=En/New_in_JavaScript_1.8#section_4

Array.forEach()
Array.map()
Array.filter()
Array.reduce()
Array.reduceRight()
Array.some()
Array.every()


In PHP something like this would be nice:

$processedDirectoryIterator = SplFunctional(new 
DirecotoryIterator(__DIR__)).map(function() {
     // do stuff here
});

where SplFunctional is a function returning a SplFunctional object whose 
construcor accepts iteratable
structures (arrays or Traversables) and $processDirectoryIterator is a 
DirectoryIterator resulted after applying
the lamba to each of the SplFileObjects contained.

I know right now we have FilterIterator as an equivalent to 
array_filter() for Iterators and we could implement our
own Functional classes but that means a new class for situations where a 
simple lambda could do the job
just as well.

I hope my proposal makes sense.


P.S. I introduced a SplFunctional function just to skip the 
instantiation of the object.



On 10/28/2008 15:16, Lars Strojny wrote:
> Hi Andrei,
>
> Am Montag, den 27.10.2008, 11:34 -0700 schrieb Andrei Zmievski:
> [...]
>    
>> I would say "no" for 5.3. But for 6 it would be fantastic to have all array-related
>> operations supporting ArrayAccess interface, where possible.
>>      
>
> +1 for this.
>
> cu, Lars
>