请问如何用php把数据库数据转换成二维数组

小弟刚学习php，请问要怎么把如下数据库的数据转换成二维数组的形式，非常感谢！
$books = array(

"1" => array("1101" => 3, "1102" => 5,"1103" => 2,),

"2" => array("1101" => 2, "1102" => 5),

"3" => array("1102" => 5)

);

//连接数据库，分别输入地址，用户名，密码
$con = mysqli_connect('localhost','mysqlUserName','mysqlPassword');

//选择数据库，输入数据库名
mysqli_select_db('dbName',$con);

//执行SQL语句，搜索表
$result = mysqli_query("SELECT * FROM TABLE_NAME ");

//根据搜索结果取得数组
$books  = mysqli_fetch_array($result);

//输出数组
var_dump($book);

不好意思刚才没看清题目，这个用foreach就可以解决

 foreach($data as  $value){
    switch($value['uid']){
        case 1:
            $book[1] = array($value['bookid']=>$value['score']);
            break;
        case 2:
            $book[2] = array($value['bookid']=>$value['score']);
            break;
        case 3:
            $book[3] = array($value['bookid']=>$value['score']);
            break;
    }
}