Hello all you great PHP peeps.  I'm trying to upload a few PDF documents that I scanned for the clients, like invoices, confidentiality agreements, etc.  I want them to register, login, and be able to see their profile and documents they have access to.  I will either FTP the files via Filezilla per client or do it through the web browser, maybe through a simple admin panel.How do I secure the directory for ONLY that user to access his files only?