Neos\Flow\ResourceManagement\Storage\FileSystemStorage::getObjectsByCollection PHP Method

    public function getObjectsByCollection(CollectionInterface $collection, callable $callback = null)
    {
        $iterator = $this->resourceRepository->findByCollectionNameIterator($collection->getName());
        $iteration = 0;
        foreach ($this->resourceRepository->iterate($iterator, $callback) as $resource) {
            /** @var PersistentResource $resource */
            $object = new StorageObject();
            $object->setFilename($resource->getFilename());
            $object->setSha1($resource->getSha1());
            $object->setMd5($resource->getMd5());
            $object->setFileSize($resource->getFileSize());
            $object->setStream(function () use($resource) {
                return $this->getStreamByResource($resource);
            });
            (yield $object);
            if (is_callable($callback)) {
                call_user_func($callback, $iteration, $object);
            }
            $iteration++;
        }
    }