(PHP 5 >= 5.3.0, PHP 7)
MultipleIterator::key — Gets the registered iterator instances
public MultipleIterator::key ( ) : array
Get the registered iterator instances key() result.
This function is currently not documented; only its argument list is available.
This function has no parameters.
An array of all registered iterator instances, or false
if no sub iterator is attached.
A LogicException if mode MIT_NEED_ALL
is set, and at least one attached iterator is not valid.
Calling this method from foreach triggers warning "Illegal type returned".
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https://www.php.net/manual/en/multipleiterator.key.php