php mysql like 实现多关键词搜索的方法

或者叫，分词检索数据库

$res = mysql_query("select * from peter where id like '%中草药%' and '%6%'"); //这样写是报错的；

$res = mysql_query("select * from peter where id like '%中草药%' or '%6%'"); //而这样写是正确的；奇怪~

$res = mysql_query("select * from peter where id like '%中草药%' and id like '%6%'"); //这样写是正确的；

$res = mysql_query("select * from peter where id like '%中草药%' or id like '%6%'"); //这样写都是正确的；