mailchimp api 2.0 subscribe through php?

mailchimp api 2.0 subscribe through php?

I need an example of how to subscribe a email address to mailchimp
newsletter.
Please check new api link here:
https://bitbucket.org/mailchimp/mailchimp-api-php
This is new malichimp api and I am not sure how to use it. :(
For MailChimp 2.0 API, not for 1.3.
Please somebody provide an example on how to subscribe user to mailchimp.
Thank You.