How to draw social networking graph?

I want to implement social networking graph for companies and employees in my PHP CRM System.

Do you know any php related technology or else can do this?

开发者_开发知识库Thanks a lot.

Edit:

chart -> graph

If you can install software on your server, check out Graphviz which is great on drawing such diagrams and charts. It is called from the commandline so you have to use shell_exec in PHP.

Update: I made this example page: http://lajm.eu/emil/dump/graphviz/

http://pchart.sourceforge.net/

Prefuse library: both Java and Flex implementations. You could serve an applet from your PHP system.