Flysystem is a file storage library for PHP. It provides one interface to interact with many types of filesystems. When you use Flysystem, you're not only protected from vendor lock-in, you'll also have a consistent experience for which ever storage is right for you.
You can always create an adapter yourself.
If you discover any security related issues, please email [email protected] instead of using the issue tracker.
Oh, and if you've come down this far, you might as well follow me on twitter.