Active Internet Marketing has released the only commercially available PHP interface software for the new Yahoo Search Marketing Enterprise Web Services API.

This library will save your business hundreds of hours! The software is available to all Yahoo Search Marketing Ambassadors and companies with a valid license to access the EWS API. If you don't have these, it won't do you any good anyways.

ewsPHP is compatible with PHP4 and PHP5 

Over 15,000 lines of code to make your PHP applications practically write themselves.

setKeywordSponsoredSearchMaxBid('123456', '5.00');

 All the commands to the API work this way. Just pass a little information to a function (usually named the same as the API command) and ewsPHP does the rest. It makes the soap call, handles any errors, and sends the result back. The documentation really spells it all out for you if you are interested in the advanced details.

That's it, the system takes care of ALL the hard work. 

Take a look at the documentation to get a better idea of how complete this is. Everything that this system has to offer is clearly documented.