$path = "/path/";
foreach (new RecursiveIteratorIterator(
           new RecursiveDirectoryIterator($path,
                RecursiveDirectoryIterator::KEY_AS_PATHNAME),
                    RecursiveIteratorIterator::CHILD_FIRST) as $file => $info) {
    if ($info->isDir())
    {
        echo $file."<br />";
    }
}