try this
// $result is your input array
$arr_filter_keys = array("name", "id_number"); // array of keys to be filter
$arr_filter_result = array(); // output array
foreach($result as $key=>$arr)
{
foreach($arr_filter_keys as $filter_key)
{
$arr_filter_result[$key][$filter_key] = $arr[$filter_key];
}
}
print_r($arr_filter_result); // output array
UPDATE 2 :
if you want to result in same array
// $result is your input array
$arr_filter_keys = array("name", "id_number"); // array of keys to be filter
foreach($result as $key=>$arr)
{
foreach($arr as $k=>$v)
{
if(!in_array($k, $arr_filter_keys))
{
unset($result[$key][$k]);
}
}
}
print_r($result); // output array