3v4l.org

run code in 300+ PHP versions simultaneously
<?php $contents = new RecursiveCallbackFilterIterator( new RecursiveDirectoryIterator(__DIR__), function ($current, $key, $iterator): bool { return true; }, ); while ($contents->valid()) { echo $contents->getSubPathName() . "\n"; $contents->next(); }
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.24, 8.3.0 - 8.3.13

preferences:
59.41 ms | 406 KiB | 5 Q