php连接mysql二种方法 mysql乱码问题

//在conf/php.ini中,在vim用"/php_mysql"搜索到extension=php_mysql.dll,去掉前面的";",同时在下面增加extension=php_mysqli.dll;
$mysqli = new mysqli("127.0.0.1","用户名", 密码","库名");
$query="select * from  表 order by theindex desc";
$mysqli->query("set names gb2312");//注意此处不加会乱码
$result = $mysqli->query($query);
 //printf() 函数输出格式化的字符串
while(list($name, $theindex) = $result->fetch_row())
 echo(" <br />".$name.$theindex);
$con = mysql_connect("localhost", "用户名", "密码");
if ($con) {
  mysql_query("set names 'gb2312'");
  mysql_select_db("库名", $con);//注意此处不加会乱码
  $rs = mysql_query("select * from  表 order by theindex desc;", $con);
  if ($rs) {
    echo ("<table border=1>");
        while($row = mysql_fetch_assoc($rs))
        {
           echo "<tr>" .
           "<td>$row[theindex]</td>" .
           "<td>$row[name]</td>" .
           "</tr>";
        }
        mysql_free_result($rs);
        }
        echo ("</table>");
        mysql_close($con);
}