PHP / CURL script needed for FTP to remote server

I need a web script that will use PHP and CURL to synchronise the content of a folder in the source web space with the content of the folder in the destination web space, the destination account being a domain on the same server or on a different server.

The synchronisation only needs to happen one way, from the source account to the destination account and needs to FTP new folders, files and images as well as delete those that are not on the source account any more.

The FTP login details for the destination account, as well as the folder path and names in both the source and destination account will be held in a database so the script should be able to connect to a MySQL system to retrieve the info.

There should be a facility to determine what type of files (extensions) can be copied across.