Almost the same as in your previous question:
$iterator = new RecursiveIteratorIterator(
new RecursiveDirectoryIterator($yourStartingPath),
RecursiveIteratorIterator::SELF_FIRST);
foreach($iterator as $file) {
if($file->isDir()) {
echo strtoupper($file->getRealpath()), PHP_EOL;
}
}
Replace strtoupper
with your desired function.