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Date: Wed, 11 Jul 2012 16:04:59 -0700
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To: Nikita Popov <nikita.ppv@gmail.com>
Cc: PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Internal iteration API
From: pollita@php.net (Sara Golemon)

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Love the idea. +1

On Wed, Jul 11, 2012 at 3:17 PM, Nikita Popov <nikita.ppv@gmail.com> wrote:

> Hi internals!
>
> Currently PHP does not have an internal iteration API that supports
> both arrays and Traversable objects. Because of that it is currently
> not really possible to write functions (or language features) that
> work on arbitrary traversables. That's probably also the reason why
> function like array_sum() currently work only on arrays and arrays
> only.
>
> So I'd really like to have such an API. One idea for an implementation
> would be this:
>  * Create a zend_create_iterator_from_zval() function, which returns a
> zend_object_iterator
>  * For arrays and plain objects this would create a thin wrapper
> around the zend_hash_* iteration functions
>  * For objects defining get_iterator this would just return the
> object_iterator that get_iterator returned
>  * Usage:
>
>        zend_object_iterator *iter = zend_create_iterator_from_zval(zval);
>        if (iter->rewind) iter->rewind(iter);
>        while (iter->valid(iter)) {
>            zval **value;
>            iter->get_current_data(iter, &value);
>            // do something
>            iter->move_forward(iter);
>        }
>        iter->dtor(iter);
>
> I like this approach because it reuses the existing
> zend_object_iterator API. But I see that this is rather an abuse than
> a use :)
>
> Thoughts?
>
> Nikita
>
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