OAuth Libraries and Code
Because OAuth is an open standard, you can take advantage of several open-source client libraries for OAuth. These libraries, available for various languages, can reduce the time you spend implementing authorization for your service or app. You can review these libraries on the OAuth site: http://oauth.net/code
Note
The OAuth libraries for PHP, Perl, Python, and C# are compatible with the latest version of OAuth that Yahoo! supports.
Note
If you want to access to Yahoo! Open Strategy (Y!OS) APIs using PHP, you can use the Yahoo! Social SDK for PHP, which includes simplified OAuth authorization. For more information, refer to the Creating an OAuth Application tutorial.