Flysystem is a filesystem abstraction which allows you to easily swap out a local filesystem for a remote one.

• Have a generic API for handling common tasks across multiple file storage engines.
• Have consistent output which you can rely on.
• Integrate well with other packages/frameworks.
• Be cacheable.
• Emulate directories in systems that support none, like AwsS3.
• Support third party plugins.
• Make it easy to test your filesystem interactions.
• Support streams for big file handling.

Through Composer, obviously:

composer require league/flysystem

You can also use Flysystem without using Composer by registering an autoloader function:

spl_autoload_register(function($class) {
    $prefix = 'League\\Flysystem\\';

    if ( ! substr($class, 0, 17) === $prefix) {
        return;
    }

    $class = substr($class, strlen($prefix));
    $location = __DIR__ . 'path/to/flysystem/src/' . str_replace('\\', '/', $class) . '.php';

    if (is_file($location)) {
        require_once($location);
    }
});

Want to get started quickly? Check out some of these integrations:

• Laravel integration: https://github.com/GrahamCampbell/Laravel-Flysystem
• Symfony integration: https://github.com/1up-lab/OneupFlysystemBundle
• Zend Framework integration: https://github.com/bushbaby/BsbFlysystem
• CakePHP integration: https://github.com/WyriHaximus/FlyPie
• Silex integration: https://github.com/WyriHaximus/SliFly
• Cilex integration: https://github.com/WyriHaximus/cli-fly
• Yii 2 integration: https://github.com/creocoder/yii2-flysystem
• Backup manager: https://github.com/heybigname/backup-manager

• Local
• Amazon Web Services - S3 V2: https://github.com/thephpleague/flysystem-aws-s3-v2
• Amazon Web Services - S3 V3: https://github.com/thephpleague/flysystem-aws-s3-v3
• Rackspace Cloud Files: https://github.com/thephpleague/flysystem-rackspace
• Dropbox: https://github.com/thephpleague/flysystem-dropbox
• Copy: https://github.com/thephpleague/flysystem-copy
• Ftp
• Sftp (through phpseclib): https://github.com/thephpleague/flysystem-sftp
• Zip (through ZipArchive): https://github.com/thephpleague/flysystem-ziparchive
• WebDAV (through SabreDAV): https://github.com/thephpleague/flysystem-webdav
• PHPCR: https://github.com/thephpleague/flysystem-phpcr
• Azure Blob Storage
• NullAdapter

• Memory (array caching)
• Redis (through Predis)
• Memcached
• Adapter
• Stash

Check out the documentation

If you discover any security related issues, please email frenky@frenky.net instead of using the issue tracker.

Oh and if you've come down this far, you might as well follow me on twitter.