唐诗三百首搜索

$key=$_POST["keys"];
    if($key=="")
    {
        echo "input error!";
    }
    else
    {

        switch($_POST["mode"])
        {
               case "author": author($key);                //按作者查询
            break;
               case "title": title($key);                //按诗词题目查询
            break;
               case "content": content($key);          //按诗词内容关键字查询
            break;
        }
    }