A search engine is a lot more than the displayed page
while php/mySQL is an ok choice for the front end, you need to consider the data source
are you going to spider your own links ?
or perhaps download data from DMOZ?
or subscribe to a ppc search engine
or just get people to submit links
If you are going to spider your own then you need to look into other technologies.
sorry I do not know of any particular site have you googled the problem ?
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