A McGraw Hill Book Plug-in PHP: 100 Power Solutions
By Robin Nixon (McGraw Hill 2010, ISBN 978-0071666596)

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Chapter 10: Plug-in 76 - Search Yahoo!

Both Yahoo! and Google provide excellent search results and Microsoft's Bing search isn't bad either. But because the quality of Yahoo!'s results are, in my opinion, equal to Google's I thought I would root for the underdog and provide a plug-in for Yahoo!'s search API, particularly considering that their API allows unlimited uses per day (although they reserve the right to limit this and/or charge in future), plus you are permitted to re-order and blend the results with other content. Using this plug-in you can provide three arguments to have up to 50 results returned at a time, and can page through the remaining results as deeply as you like.

The Figure shows the plug-in being used to find websites relating to the query yahoo search api.