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；