You really don't need to know any php to add tracking. Google Analytics is great, really easy and free. (I want to hate Google, but they do make such good stuff!)
If you are running ppc campaigns and want to track keywords, ad groups, etc this might be useful:
Using AdWords Dynamic Parameters in Links » eWhisper.net
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Great thread Mike, it's really good to see someone in your position freely giving out great advice and not trying to promote your own network, as I'm sure others might do.
I've got a small Copeac issue, which I've mentioned to Danielle but it's relevant to other people so I'll bring it up here. As I'm outside the US I can't see the merchants landing pages for US only offers, that's not really a problem as I can use a proxy or go direct to the merchants site without using the Copeac links.
I'm new to promoting CPL offers, so rather than invest time and money in creating a landing page/site (and introducing another variable) I was looking to first test a few different offers in the same niche that have merchant landing pages seemingly attractive to search engine traffic. I figure if I can get them to be profitable direct to merchant then building a landing site can only increase my ROI.
The problem: I had an Adwords campaign suspended for popups - I don't get any going directly to the merchants site or using the Copeac link in a proxy though. I spoke to Danielle, who was great and said she'd see about getting the popup removed - which seems like an incredible thing for a network to do for an affiliate that's not yet making them money! You probably don't need to go to this extent though. Is there anyway you could indicate where offers have popups? Or provide test links for each campaign that don't redirect non-US traffic? I think this would be useful for other affiliates outside the US as well.
Very impressed with what I've seen of your network so far, looking forward to working with you.
Sorry for such a long post!