offsetGet($index) returns the value stored at $index in the cache. Until you've iterated over the items, the cache is empty and the index will not exist. <?php $cache = new \CachingIterator( new \ArrayIterator(['a', 'b', 'c', 'd']), \CachingIterator::FULL_CACHE); $shortRange = range(0, 1); foreach ($shortRange as $index) { $cache->next(); } echo PHP_EOL . 'The cache' . PHP_EOL; var_export($cache->getCache()); echo PHP_EOL; echo $cache->offsetGet('1') . PHP_EOL; echo $cache->offsetGet('2') . PHP_EOL;?>The cachearray ( 0 => 'a', 1 => 'b',)bUndefined index: 2
