<?php
$dir = new RecursiveDirectoryIterator(getcwd());
$files = new RecursiveIteratorIterator($dir);
$files_sorted = array();
foreach($files as $path) {
    array_push($files_sorted, substr($path, strlen(getcwd()), strrpos($path, "\\")-strlen(getcwd())));
}
$files_sorted = array_unique($files_sorted);
foreach($files_sorted as $dir) {
    echo $dir . "<br>";
}
?>