How do I alter array keys and values while using a RecursiveArrayIterator?

It seems that values in plain arrays aren't modifiable because they can't be passed by reference to the constructor of ArrayIterator ( RecursiveArrayIterator inherits its offset*() methods from this class, see SPL Reference ). So all calls to offsetSet() work on a copy of the array.

Looks like getInnerIterator creates a copy of the sub-iterator.

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