I am having a hard time trying to figure out how to work a file handling.
I am able to upload a file to a specific directory (e.g. _assets/professors/)

I have an insert php page where I enter a professor's name in a form field and
I want to use the <option value="">List Content In Folder Directory</option> to
choose the image in the folder directory that has been uploaded in Ascending
order.
<select name="photo" id="photo"> *
<option value="N/A">N/A</option>
</select>