To reflect:
A-B
A-C
A-D
..
B-D
..
Is there an easy way to do this?
To reflect:
A-B
A-C
A-D
..
B-D
..
Is there an easy way to do this?
Graphviz is a graph visualizer. It can be user to render graphs from string input.
I don't know if it's possible using only PHP. But if you can install programs on the system running PHP you could use Graphviz's tools via exec.
Prefuse is a flash based visualization package. You could probably use PHP to load your data into a Prefuse based visalization on a webpage. I'm assuming here that this for a web based application.