What do you want to do? Have you tried the GraphViz support if they have any? We're here to help with php code, not explain other programs, nor write code for people. So what we can do is if you supply some php code that's not working, we'll try and tell you why. I am guessing GraphViz is written in php (if not why are you posting in the php forum)?
Mate, we're not graphwiz support forums. Have you tried looking for support/intallation/use on google? graphwiz is not a standard php application, it's made by someone else. Bring php problems and we will help.
** Also do you mean graphwiz or graphviz? Two different applications.
Here are some pages you can read through, download, try and then ask questions from:
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