$con = mysql_connect("localhost","root","");//连接数据库
mysql_select_db("btxiazai",$con);//选择数据库
mysql_query("set names utf8");
$sql = "select * from persons order by id desc limit 2";//获取persons中的数据，并按id倒叙排列，取其中两条
$get = mysql_query($sql);//执行sql
while($result = mysql_fetch_assoc($get)){//取回数据
}
select * from table order by id desc limit 2
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