How to capture if a visitor is from a google adwords click

Question

When a user signs up on my site I want to be able to store whether or not they came to my site via an Adwords campaign.

I know google uses javascript to track conversio

Answer 1

You could add an additional url parameter to the url you gave at google adwords, and check for it on your site and store in a session variable or cookie.

At registration of a user account check for this session or cookie you have created and act accordingly..