function iterateDirectory($i) {
    $dnumber = 0;
    $fnumber = 0;
    echo "<ul>";
    foreach ($i as $path) {
        if ($path->isDir()) {
            if (!preg_match('/\.\.$/', $path, $matches)) {
                $newpath = replacepath($path);
                echo "<li class='directory sortit' id='directory$dnumber'>";
                echo "<span class='caret'>";
                echo "<a href='delete.php?path=" . $path . "'><button class='btn btn-secondary'>Delete directory</button></a>";
                echo $newpath;
                iterateDirectory($path);
                echo "</span>";
                echo '</li>';
                $dnumber++;
            }
        } else {
            echo "<li class='file sortit' id='file$fnumber'>";
            echo "<a href='delete.php?path=" . $path . "'><button class='btn btn-secondary'>Delete image</button></a>";
            echo $path;
            echo "</li>";
            $fnumber++;
        }
    }
    echo '</ul>';
}

function replacepath($oldpath) {
    $newpath = "<button class='collapsible'>" . "folder:" . $oldpath . "</button>";
    return $newpath;
}

$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($curuser));

iterateDirectory($iterator);