How I can do:
1. Upload multiple files into folder.
2. Then fetch those files that had saved in a folder. (I have to upload once but fetch again and again )
3. and Then attach those files one by one and send to specified email/s.
How these file are uploaded to server? FTP, WebDav, forms?
How you have to send the files? As attachments or as download links? Second option, if you can, is preferable.
Basically anyway, if you want to submit by forms, you have to build a proper form to upload files, use the relative array $_FILES to check, rename and move them to a directory (throught move_uploaded_file()) and finally use mail() or PEAR mail() which is better for long running loops:
Both procedures: upload and mail attachments, have been discussed in the forum.
If the email list is fixed I suggest you to build an array and use that instead of a database connection, so you can speed up and limit hits on database.