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Vikram Vaswani writes a very nice article on how to use PHP to process and integrate data from Google Calendar into a custom application. "This article will introduce you to the Google Calendar Data API, showing you how to integrate and use calendar data with a custom PHP application. It includes examples of how to: Retrieve events from a user's public notebooks; Add new events; Modify and delete events; Search for events by keyword or date range".
The examples in the article will introduce you to the Google Calendar feed format, you how to search for calendar entries by date and keyword, explain how to add, modify and delete calendar entries and illustrate how to build a customized front-end to the Calendar service.