zicht / itertools

    public function __construct(/* \Iterator $iterable, \Iterator $iterable2, ... */)

    {

        parent::__construct();

        foreach (func_get_args() as $iterable) {

            if (!$iterable instanceof \Iterator) {

                throw new \InvalidArgumentException(sprintf('Argument %d must be an Iterator'));

            }

            $this->append($iterable);

        }

    }

    /**

    public function __construct(/* \Iterator $iterable1, \Iterator $iterable2, ... */)

    {

        parent::__construct(\MultipleIterator::MIT_NEED_ALL| \MultipleIterator::MIT_KEYS_NUMERIC);

        foreach (func_get_args() as $iterable) {

            if (!$iterable instanceof \Iterator) {

                throw new \InvalidArgumentException(sprintf('Argument %d must be an iterator'));

            }

            $this->attachIterator($iterable);

        }

        $this->key = 0;

    }