Setting up so access through scripts is denied

[fathomboy]

How would I go about setting up a server so that I can have addon domains, and when someone tries to access ftp, they cant use a php file to access /home/<name> because their website would be /home/<name>/websites/<theirSiteRoot>/ and of course they have a www folder which is where the public folder would go.

Please tell me if there is a way to restrict file access through any language to /home/<name> and even /home/<name>/websites

Please don't tell me it isn't a good idea, this is so my friend can have his own site and stuff along side mine, because he is new, and just starting to learn php

[phranque]

if the Server Root is /home/<name>/websites/<theirSiteRoot>/ then a web script shouldn't be able to access parent directories.

this assumes there aren't weird symbolic links in the web directories and you have configured proper permissions and ownership of directories.

[whitespace]

You wouldn't generally use an "addon domain" if you need to restrict access. That is... if by "addon" domain you are referring to something like cPanel's "Addon Domains"? How are you defining your "addon domains"?

...a way to restrict file access through any language

Again, you wouldn't really use a "language" to restrict FTP access... FTP access is determined by the server config and file/directory permissions/owners. (?)