Multiple client's directories management in an Application Service Provider model

I need web-based, platform independent application that implements Application Service Provider (ASP) model.
It will be developed using PHP. I am looking for an open source resource that provides the mechanism on how to manage the multiple client's directories in the application.

Thank you very much.
llping8Asked:
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walkerkeCommented:
Since PHP is not platform independent, that would be difficult. Could you elaborate on what an Application Service Provider model is? Does the client have multiple directories or are there multiple clients whom each have a directory? Where is the directory located, locally on their computer or on a server?
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llping8Author Commented:
Lets assume it is on a Linux server. As I know, Application Service Provider (ASP) model a.k.a. "Software as a service".
There is a server with an application. The application provides service to clients. Basically each client will have their own directory (basically is ONE directory for each client). When a client sign in, he will only able to access his data in his own directory. There is only one application running.

My question is how does PHP  manage the client access? After a client sign in, how PHP can prevent him/her from accessing other client's directory.
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llping8Author Commented:
The client's directory is in the server where the application resides.
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llping8Author Commented:
Additionally, each client will have his/her own database (MySQL) space to store data. So, when a client sign in, only the respective file directory & database is available for access.
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walkerkeCommented:
This is really beyond my expertise, so I hope someone else will contribute.

My own approach to this would be to use PHP's rich file system features to do all the file management. I would assign a unique identifier code to each user and begin each folder and file name with that code, but mask out the code when presenting the directory tree to the client's browser. I would embed a safeguard within the PHP application which prevents the client from maneuvering to a folder or accessing a file that does not being with the same code as the one they are maneuvering from. I would also implement a PHP session and tie the session id to the client id.

MySQL's own security features will prevent one user from accessing another user's data unless they are specifically given access to it.
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llping8Author Commented:
Thank you, walkerke. I appreciate your input. I will search other resources as well.
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llping8Author Commented:

I am googling & yahooing all the while, and only thing that i can think of is the mechanism used in some web content management system. I am wondering, how are those CMS manage so many users directory without letting users view other user's content. Are they open new directory for a new user? I tried to install Mambo in my localhost to do some research.
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llping8Author Commented:
I guess I was wrong about CMS. Each CMS only manage ONE website. With multiple manager can access. But basically they are managing the same site with differrent level of access.  It is a different story.
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