Re: Internal iteration API

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 > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: http://www.php.net/unsub.php > >