Recently github introduces contributions chart. So I peeped into some of the people of our php community. It seems @fabpot is the one who contributes almost every day. Just 21 days without any contribution.
and I too did some contributions in 2012 for auraphp and other projects.
The list is not complete, if you feel I missed your name or someone you feel needs to be added just give a tweet to me or fork the repo from github and send a PR.