Question

I know that by implementing iterable you can make an object able to be foreached over. I’d like to take it further and make an object react like an array would in as many places as possible where an array is called for.

(The reason for this is because I’m selecting data from a database, and the statement object that results by default is very good on memory, whereas the full dataset in array form tends to throw the memory usage into orbit. I’d love to have the best of both worlds, array type usage with the lower memory usage up until the moment that an array type of behavior is called for.)

Answer 1

• You can make your object Countable so that it works with count
• You can implement ArrayAccess, so that syntax like $obj['index'] works.
• Like you’ve done, you can implement Iterator or IteratorAggregate.

What you can’t do:

You can’t make it work with the array functions, except these, which kind of work, but rely on converting the object to an array, which is done by fetching its properties:

• end, prev, next, reset, current, key
• array_walk, array_walk_recursive, array_key_exists.