Some iterators need to be rewound and some don't

some-iterators.php

<?php

$iter1 = new LimitIterator(new ArrayIterator(range('a', 'z')), 0, 5);
var_dump($iter1->valid(), $iter1->key(), $iter1->current());
#> bool(false)
#> NULL
#> NULL

$iter2 = new MultipleIterator();
$iter2->attachIterator(new ArrayIterator(range('a', 'z')));
var_dump($iter2->valid(), $iter2->key(), $iter2->current());
#> bool(true)
#> array(1) {
#>   [0] =>
#>   int(0)
#> }
#> array(1) {
#>   [0] =>
#>   string(1) "a"
#> }