> -----Original Message-----
> From: Nikita Popov [mailto:nikita....@gmail.com]
> Sent: 11 July 2012 23:17
> To: PHP internals
> Subject: [PHP-DEV] Internal iteration API
>
> 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
>
I presume this would work with list() too?
function *f()
{
yield 'a';
yield 'b';
}
list($a, $b) = f();
Jared
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