SSO - Simple Single Sign-On for PHP
Jasny SSO is a relatively simply and straightforward solution for single sign on (SSO). With SSO, logging into a single website will authenticate you for all affiliate sites. The sites don't need to share a toplevel domain.
http://www.jasny.net/articles/simple-single-sign-on-for-php/
https://github.com/jasny/sso
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