Which PHP chart solution do you use?
pierrefar: There are quite a few.BUT:When I looked into this a few months ago, I found that PHP generation of graphs is expensive. It was cheaper to send just the data to the browser and let a Flash control or jQuery do the graphing. This removes a big bottleneck.I settled on a for-pay mapping Flash control and an open source Flash graphs control. Both accept data in sensible XML and so it wasn't hard to talk to them.