PHP Manual: ArrayIterator::_

public function ArrayIterator::__construct(array|object $array = [], int $flags = 0)

Warning

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

array: The array or object to be iterated on. Passing an object is deprecated as of PHP 8.5.0.
flags: Flags to control the behaviour of the ArrayIterator object. See ArrayIterator::setFlags().

As of PHP 8.5.0, throws an InvalidArgumentException if array is an enum.

Version	Description
8.5.0	Passing an enum as `array` now throws an InvalidArgumentException.
8.5.0	Passing an object as `array` is deprecated.

ArrayIterator::__construct