这个php类能够分析用户是通过搜索引擎的哪个关键词来带你的网页的，这个就是网站统计中的关键词和来路两个功能！英文介绍如下：
Where are my site visitors coming and why, are frequent questions asked by many site owners. One way to track that information is using the HTTP referer headers that tell the URL of the page that the user visited before the current page.
The search engine sites are one common source of new visitors. Usually the user searches for something and the search engine site presents a list of pages where what is searched may be found. The search keywords are part of the URL of the search engine result pages. When the use clicks on a result link and accesses the listed site, usually the browser passes to that site the URL of the search engine results page in the HTTP referer header.
What this class does is to parse the HTTP referer header and try to match it against the URL pattern of several well known search engine sites.
This definitely helps answering Web site owner questions about where did my site visitors come from and what where they searching for that lead them to my site.
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