Creating a drag and drop system

I'm creating sort of a "local website" for organizations that need to spread digital resources in parts of the world where internet is either too unstable or doesn't exist at all. It all runs off of a usb drive pluged into a wireless router with modified firmware (very similar to a PirateBox, if you're familiar with that).

I need the users to be able to simply drag and drop files into specified folders and have them appear on the site. I was using PHP's GLOB to do this, but the software which runs all of this (which I did not create) seems pretty limited for what it allows PHP to do. Specifically, it won't allow GLOB to work.

Here's the code I originally intended on using, if that's any help:

<div>
    <?php
        $docs = glob("other_docs/*.{pdf,txt,doc,docx}", GLOB_BRACE);
        foreach ($docs as $doc) { ?>            
                <a href='<?php echo $doc; ?>' target='_blank' class='backing'>
                        <h3><?php echo substr($doc, 11); ?></h3>
                </a>            
    <?php       
        }
    ?>
</div>

So, basically, I need to do the same thing (allow users to drag and drop files into certain folders and have it appear on a certain web page), but with a different tool instead of PHP. I'm a new programmer so I'm not very familiar with what tools are available that will achieve this. Is this something Python could easily accomplish? Or is there some other way to do this that I may not have thought about yet?

Any advice is appreciated!