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<?php // Everything you enter here will be executed by our servers. Try it! function iterator_compose() { foreach (array_reverse(func_get_args()) as $it) { if (is_callable($it)) { $prev = $it; } } } function iterator_chunk(\Traversable $it, $chunkSize) { $it = new \IteratorIterator($it); $chunk = []; $steps = range(0, $chunkSize); while (true) { foreach ($steps as $_) { if (!$it->valid()) { break 1; } $chunk[] = $it->current(); $it->next(); } yield $chunk; $chunk = []; } if ($chunk) { yield $chunk; } } $it = new ArrayIterator(range(0, 125)); foreach (iterator_chunk($it, 32) as $i => $c) { echo "====== Chunk $i ======\n"; var_export($c); echo "\n"; }