How to write a server-efficient ad network script?

Question

I'm writing an ad script that loads advertisements to websites across the network. The ad script has to keep a detailed log and serve advertisements. At the very minimum, it should log the number of impressions for each advertiser and the number of impressions for the publishers.

I'm thinking about building the backend on PHP and then having the actual ads themselves display through document.write-ing some JavaScript, but if this is not the most efficient way, please let me know what the most efficient way is.

One limitation is that the ad script must be very efficient. Anyone have any ideas?

Answer 1

I figured this out.