Next item aware iterator

NextItemAwareIterator.php

<?php

$collection = collect(['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine', 'ten']);
$iterator = $collection->getIterator();

foreach ($iterator as $item) {
    $iterator->next();
    
    // Next item in collection. Before doing anything with it
    // should check if the "next" one is not null.
    $next = $iterator->current();

    if ($iterator->key() > 0) {
        // Put interal pointer to previous item, as next "current" one will skip 1 item, as in every non-first
        // loop internal pointer already gets moved one position forward.
        $iterator->seek($iterator->key() - 1);
    }
}