AdWords API developement for requesting CPC (in PHP)

PLEASE do only place a bid if you are experienced in the AdWords API, especially in geting the click prices for keywords! Okay, let's start! :-) I want to overgive between 1 and 10 different keywords or keyword phrases per GET to a php website and need as the results the click prices (CPC) for each of them. Please set some filters/operations that the script can calculate basing on the lower CPC and upper CPC a middle value which is comparable with the CPC which the website based keyword tool gives out to the same keywords. (<[login to view URL]>) That's it!