Offers hands-on tips and numerous code examples that show Web developers how to leverage content and feeds from today's top Web sites-including Google, eBay, PayPal, Amazon, Yahoo!, and FedEx Introduces APIs (Application Program Interfaces) in general and uses real-world examples that show how to produce and document them Explains how to use the popular scripting language PHP to create APIs that interact with unrelated applications over the Web Examples take readers through each stage of the API process, from basic test implementations to integration with existing sites