How to implement auto-get Label function

If I have created a document, it is a collection of all the required tags. A collection of tags for my document that appears in an article I need to extract him as the key word in the article.
How this should be done, preferably in PHP.
I found a Chinese word on the Internet (HTTP-SCWS), but do not know how to use it?

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If I have created a document, it is a collection of all the required tags. A collection of tags for my document that appears in an article I need to extract him as the key word in the article.
How this should be done, preferably in PHP.
I found a Chinese word on the Internet (HTTP-SCWS), but do not know how to use it?

It is probably using Chinese word segmentation to separate the words and then filter out some, according to the frequency of the word sort and so on
Remember there is DZ has this function can go to see the code

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