allows you to use a pseudo directory path in your HTML links --instead of a query string-- to declare variables so that your pages will be properly crawled by search engines. This is an alternative to using mod_rewrite rules to handle your URIs (http://httpd.apache.org/docs/mod/mod_rewrite.html). I based this on several articles and news posts I read on how search engines crawl dynamic, php-generated URLs.
see the class comments for more info and links to the articles.
at the moment, PHP >= 4.1.0 is required
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