One of YouTube's cooler features is its YouTube Data API, which allows developers to access and search YouTube video data through a REST-based API, and integrate this data into their own XML-aware application. This isn't particularly difficult to do—you write application-level code to send REST requests, parse and decode responses, and integrate the resulting data into the application interface. If you use PHP, you can perform these tasks either through YouTube's PHP Client Library, or manually parse the XML responses to your REST requests.

This article discusses the latter method, showing you how to access public content through the YouTube API and integrate this content into your PHP application using SimpleXML.

Full Article: IBM