<li><a href="http://ngiriraj.com">Giriraj</a> has written <a href="http://www.phpclasses.org/package/8000-PHP-Authenticate-users-with-OAuth-based-sites.html">light weight PHP wrapper class for oAuth 2.0</a>. Find the <a href="http://www.cheatography.com/kayalshri/cheat-sheets/oauth-end-points/">oAuth End points cheat sheet</a> and <a href="http://ngiriraj.com/socialMedia/oauthlogin/">step-by-step guide and working demo</a> for oAuth providers by using PHP.</li>