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the advantage to AJAX is that your page does not have to be reloaded in order to retrieve new data from the server. Soo... lets say you have PHP script takes parameters and spits out some results -- with AJAX that same page/script won't need reloaded. Will the SEs spider the results from your PHP script or your AJAX script? depends. if your PHP script spits out custom results to the same page, SEs probably won't spider those results; if your AJAX script does the same then SEs won't spider the results either.
the difference between the two though, is that AJAX has a bunch of JS code visible to the browser/SE and PHP does not. as others advice, if you move the JS code to an external file, things should be A-OK.
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