I have been interested for a long time and I am currently solving on one project how web hosts limit the size of given folders for projects.

I read something about quote but it doesn’t strike me as a good solution to execute from program commands. Any idea how this would work? I have made a custom sftp server so there to limit it is not such a problem but rather from the php side how could it be possible to limit that the project can store files using php but respect the maximum size of the directory? And especially to make it work for all linux users. So that there is no way around it.