Is there a way to create the server side of something similar to S3, iDrive, Dropbox, etc in strictly PHP? The end goal would be to allow users to map a drive or folder to our servers using an app that already exists for one of those popular services.
In other words, I don't really want to write the client on the OS side, but rather implement some type of standard (or popular) API so that our server would be compatible with existing apps.
If there is a standard API interface, that would be great too - as long as there are some client apps available for it. I have tried to search but haven't been able to find anything.