use League\Flysystem\Adapter\Local;
use League\Flysystem\Filesystem;
use Twistor\FlysystemStreamWrapper;

// Get a Filesystem object.
$filesystem = new Filesystem(new Local('/some/path'));

FlysystemStreamWrapper::register('fly', $filesystem);

// Then you can use it like so.
file_put_contents('fly://filename.txt', $content);

mkdir('fly://happy_thoughts');

FlysystemStreamWrapper::unregister('fly');