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| PHP Graphs |
There are so many PHP graph projects which you can find on internet. At the time of writing this post, JpGraph, phpgraphlib and pChart should appear in top Google search results. In my experience, phpgraphlib is developer-friendly and easy to use whereas JpGraph is more robust than others. pChart seems to be little bit outdated though they have updated their project.
JpGraph
phpgraphlib
