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in many sites i can see alt text http://img718.imageshack.us/img718/4633/15494794.gif

how i can do that is must tell every company or what?

bdd
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Mostafa Elkady
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1 Answers1

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It's OpenID. You can implement it in PHP easily by looking for PHP OpenID Libraries/Classes.

See http://openid.net/add-openid/add-getting-started/ to get started on developing authentication with OpenID.

Unfortunately, Facebook and Twitter has a complete different set of authorization api and thus you cannot use OpenID for Twitter and Facebook. Instead you can use their API.

mauris
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