做一个搜索引擎
就是PHP做一个搜索网站,类似百度那样,对我网站内的所有信息进行搜索。
比喻是一个论坛搜索,我输入:A B C。中间隔着空格,我能筛选出A,B,C三个分开的关键字,然后在数据库进行搜索任何与这3个关键字的内容,这就好像是一个百度搜索或者谷歌搜索的原理。
我自己想到的难点有几个:
1、对3个关键字进行处理的时候,是什么原理,用空格隔开,然后归类为两个不同的关键字?假如我两个关键字之前有别的符号呢?例如A、B 那么处理的时候,也是A和B两个关键字? 那么 A?B呢,怎么实现把关键字筛选出来??
2、在对数据库中进行搜索的时候,我有关键字 A,AB,ABC 3个关键字了,那么我是什么逻辑进行搜索?A或AB或ABC 还是A或B或C? 这个逻辑是怎样?我有点不懂,要做成百度搜索之类的。
3、假如我有很多个搜索条件(参考上面的问题),那么多得搜索逻辑,是把很多个搜索逻辑放到一个sql语句(进行一次sql查询之后返回一个结果array)?还是没一个逻辑就一个sql语句,然后对每一句查询返回结果array,然后再汇总?

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