PHP Class - Google SERPs using Google API

Looking for a PHP Class file that provides class methods to obtain the Google search engine ranking position of any given URL. In addition to the URL, the class will also take a targeted keyphrase to search against and a Google API Key. This project MUST yield a PHP Class file ( like, class GoogleSerpChecker { ... } ) that can be included in an existing script - not just a collection of functions please. Online demos appreciated and may help in the selection process.