(PHP 5 >= 5.1.0, PHP 7)
IteratorIterator::getInnerIterator — Get the inner iterator
public IteratorIterator::getInnerIterator ( ) : Traversable
Get the inner iterator.
This function has no parameters.
The inner iterator as passed to IteratorIterator::__construct().
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https://www.php.net/manual/en/iteratoriterator.getinneriterator.php