如何使用带有表单输入的子文件夹提交文件夹？

Question

I have been searching quite a lot, and I currently have an answer for folders without subfolders:

Here's my main.php page with the submit form

<form action="uploadproject.php" method="POST" enctype="multipart/form-data">
    <input type="file" name="archive[]" webkitdirectory multiple="">

    <button type="submit" name="submit">Upload</button>
</form>

Here's my uploadproject.php, where I get the submitted folder and move it to my filesystem

for ($i=0; $i < count($_FILES['archive']['name']); $i++) { 
    if ($_FILES['archive']['error'][$i]==0) {
        move_uploaded_file($_FILES['archive']['tmp_name'][$i], 'uploads/'.
            $_FILES['archive']['name'][$i]);
    }
}

This way I'm basically uploading all the folder contents into my 'uploads' folder.

How can I upload subfolders to 'uploads' as well?