3v4l.org

run code in 300+ PHP versions simultaneously
<?php $content = <<<'EOF' Line 1 Line 2 EOF; $tmpCsvFile = new SplTempFileObject(); $tmpCsvFile->fwrite($content); $iterator = new CallbackFilterIterator($tmpCsvFile, function ($row) { return true; }); echo 'l1: ', iterator_count(new LimitIterator($iterator, 2)), ' ', iterator_count(new LimitIterator($tmpCsvFile, 2)), "\n"; echo 'l2: ', iterator_count(new LimitIterator($iterator, 3)), ' ', iterator_count(new LimitIterator($tmpCsvFile, 3)), "\n";

preferences:
36.89 ms | 402 KiB | 5 Q