怎么将接收到的数组转成如上格式

我要怎么接收，才能成这样的数组？pic=>(

     *          0=>array(

     *              name=>姓名

     *              age=>15

     *          ),

0=>array(

     *              name=>姓名

     *              age=>30

     *          ),

Array

(

    [url] => Array

        (

            [0] => /uploads/13534190820.84986000.jpg

            [1] => /uploads/13534190830.00999000.jpg

            [2] => /uploads/13534190830.09639600.jpg

            [3] => /uploads/13534190830.18655000.jpg

        )



    [alt] => Array

        (

            [0] => 24234

            [1] => 23423

            [2] => 424

            [3] => 24234

        )



)

foreach($_POST['name'] as $k=>$v){

   $arr[]=array('name'=>$v,'age'=>$_POST['age'][$k]);

}

print_r($arr);

Array

(

    [0] => Array

        (

            [url] => /uploads/1562313.84986000.jpg

            [alt]=>24234

        )

 

    [1] => Array