基于Php实现自动获取关键词的分析

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基于Php实现自动获取关键词的分析_PHP

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Jun 01, 2016 pm 12:21 PM

现在的CMS都自带了采集功能，内容和标题相对来说很好处理，但大部分情况关键词很难能提取到。于是自动获取关键字成为当前PHP类CMS的“传统问题”。那如何才能自动获取关键词呢，其主要步骤主要可以分为如下三个步骤：

1，通过分词算法将标题和内容分别进行分割，提取出关键词和频度在内容的分词阶段，当前主要的两个算法是中科院的ICTCLAS和隐马尔可夫模型。但这两个都太高端，有一定的门槛，且都是只支持C++/JAVA。基于PHP的当前有两个是值得推荐的PSCWS和HTTPCWS。 SCWS于2008-03-08发布1.0.0 正式版，到现在最新版本已经到了1.0.4。PSCWS是它的PHP版。而HTTPCWS是张宴开发的，之前叫PHPCWS。PHPCWS 先使用“ICTCLAS 3.0 共享版中文分词算法”的API进行初次分词处理，再使用自行编写的“逆向最大匹配算法”对分词和进行词语合并处理，并增加标点符号过滤功能，得出分词结果。目前仅支持Linux/Unix系统。

2，将提取结果与现有词库进行比较，得到最符合规则的关键词这里主要就是要看词库了，我们可以自己定义词库，也可以使用现有的成熟词库。

3，然后将这两套关键词进行比较，得到最符合当前内容的关键词在这个阶段就是具体情况具体分析了。当前PHP类CMS都自有自己的提取关键词系统。其中在网络上流传最广的是DEDECMS的分词源码，我也在我的POPCMS上作过测试，效果很不错，不过类似“我们”等无意义的词提取并被列为关键词的频率太高，甚至有时候还会把空格的HTML提出来做为关键词，亟待改进。不过如果作为辅助功能，它已经很好了。另外PHPCMS和DISCUZ的自动提取关键词功能也很强大。

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