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原文：http://www.joesiewert.com/2010/04/how-to-use-the-foursquare-api-with-oauth-and-php/

I started playing with the Foursquare API and one of the first things you need to do is figure out how to authenticate with Foursquare to make calls to the API. It took me awhile to figure this out and start making successful calls, so I thought others could benefit from a detailed tutorial. [...]