title: How to create Openid, Google, Yahoo, facebook, twitter without using Gigya.com in php?
body: <p>How can I create a universal login system like stackoverflow?</p>
  
  <p><a href="https://stackoverflow.com/users/login">https://stackoverflow.com/users/login</a> in php?</p>
  
  <p>I don't want to use Gigya, because I don't want their branding on my site</p>