Adsense Onclick(php, javascript)

Question

I have tried to understand how to use a onclick for a adsense unit. Some say that this wont be possible and some say the opposite. What is correct ?

Is there anyway to get the onclick for a adsense unit. So when a adsense unit has been clicked, it will do something also.

Answer 1

You can't. In order to prevent abuse, AdSense ads (and most major ad serving systems) run within an iframe specifically to isolate them from your page.