Using Google-Account to log in [closed]

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i develop a php-site with user-accounts. to register easier i want to offer the user to (alternativly) log in via they´re google-ac开发者_如何学Pythoncount (like here on stackoverflow).

how to connect the google-account with my site?

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Sign in with Google account using OAuth2.0 which is clearly explained

http://www.idiotminds.com/sign-in-with-google-account-using-oauth2-0/

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A system to quick login with Google account using OpenID authentication: http://www.9lessons.info/2011/07/login-with-google-account.html

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While not really covering Google auth, I've found this article very useful when building openid authentication for my website.

http://www.plaxo.com/api/openid_recipe