The return type is merely documented here, it's not actually enforced. For instance, the IteratorIterator implementation can return Traversable, which would break the interface. Most likely, this is for backwards compatibility with code written before return type hints existed. It's still possible to create your own namespaced OuterIterator interface that extends the global one and add a typehint for this method in there.
OuterIterator::getInnerIterator
(PHP 5 >= 5.1.0, PHP 7)
OuterIterator::getInnerIterator — Returns the inner iterator for the current entry
Opis
Returns the inner iterator for the current iterator entry.
Parametry
Ta funkcja nie posiada parametrów.
Zwracane wartości
The inner iterator for the current entry.
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User Contributed Notes 1 note
Sjakie Pruts ¶
4 years ago
