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Its a similar to locate, slocate or rlocate but with the webaccess to such commands trough PHP webpage trough PHP exec commands like passthru or the goal is the web output for the searched results.
Are the files and folders you are trying to index web pages already? If so, you can use one of the open-source web spider/search engines and just tell it to only index your site.
If you're doing regular files, whatever type of server software you're running may have a service for that. I know that Mac OS X Server provides hooks for your website to access Spotlight data -- I would assume Windows Server has something similar.