Sure, but performance..

Don't forget about performance. PHP iterators are quite expensive.

As pointed out in the comment above you are already using Iterators in the background in loops so there really is no performance difference. The only difference you should ever notice is between the built-in (c code) vs doing everything in PHP. It has a lot to do with using the right tool for the job by know the language better instead of just always using what you've already learned which I believe was the point the author was really trying to make.

You seem just as unaware as the article author.
piotrpasich.com/spl-iterators-again ...