EmptyIterator::key

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

EmptyIterator::key — The key() method

public function EmptyIterator::key(): never

This function must not be called. It throws an exception upon access.

Warning

This function is currently not documented; only its argument list is available.

This function has no parameters.

Throws an Exception if called.

No value is returned.