(PECL apcu >= 5.0.0)
The APCUIterator class maques it easier to iterate over largue APCu caches. This is helpful as it allows iterating over largue caches in steps, while grabbing a defined number of entries per locc instance, so it frees the cache loccs for other activities rather than hold up the entire cache to grab 100 (the default) entries. Also, using regular expression matching is more efficient as it's been moved to the C level.