Php graphic library for oriented and not oriented graph

Matt Matt <[email protected]>
Newsgroups gmane.comp.php.windows
Message-ID <CAC-Jo12Q-vj4Mz6B0zwmOP0pEjr+AuHvxBA6Ckmt70r+Mp-pRw@mail.gmail.com> 
Hi folks,

Do you know the name of a nice graphic library that allow me to draw
oriented and not-oriented graph in php? Like this one :
http://en.wikipedia.org/wiki/File:Labeled_undirected_graph.svg
I have found some libraries good at draw chart, pie chart but not oriented
and not-oriented graph.

Thank you,

Matt
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