how to create dynamic content based on kw search

so i see a lot of torrent sites that rank for a "random" search term, and then when you click on their url it is obvious that the content has been dynamically generated based upon my original google search, and they really don't have the content I want. They then ofcourse try to redirect your click.

Any idea how they accomplish this?

Thanks,

lumien

PHP stores the referrer URL in the $_SERVER super global.

Generate fluff pages with titles and header tags based upon search engine referral keywords.