3v4l.org

run code in 300+ PHP versions simultaneously
<?php $value = base64_encode(md5('')); $start = microtime(true); for ($i = 0; $i < 100; ++$i) { $result = []; do { $result[] = $value; $value = substr($value, 0, -1); } while ('' !== $value); $result = array_reverse($result); } $end = microtime(true); echo $i/($end - $start), ' op/s', PHP_EOL; var_dump($result);

preferences:
34.07 ms | 402 KiB | 5 Q