calculate data transfer in web application

[trube]

I've written a web application, which I intend to use to create an Application Service Provider business. I want to be able to calculate Data Transfer/Bandwidth Usage. Anyone know how to do that in PHP? Would I somehow analyze server logs? Can someone point me into the right direction?

[largo]

web logs should work well here. If the web server is apache, you can point the data transfer for the site running your application to custom log files and do quite a bit with what is logged and in what format.

This can later be parsed with php or any other tool to get the information required.

For further reference, please have a look at:

http://httpd.apache.org/docs/logs.html

hth.