I have implement SOS concept between two php application. it application it available different domain like one is www.example.com and another is www.test.com.
My required following condition.
1.When user is login any appplication to login this user with check user name and password into mysql database table
2.After login any application username and password is not required/reenter user can directly login this application similar to Google.
3.When user logout at time both application can be logout.
-->my first application can be created Yii framework and another is moodle
please give idea to implement this concept in my both application