CodeIgniter row_array And result_array customize

// CodeIgniter row_array() And result_array() Customize

//row_array()
$result = $query->row_array();
$remove = array('created_at','updated_at'); // Remove Field Name
$arr_list_removed = array_diff_key($result, array_flip($remove));

//row_array()
$allowed = array('first_name','last_name','email','gender'); // allowed Field Name
$arr_list_allowed = array_intersect_key($result, array_flip($allowed ));

//result_array()
$result = $query->result_array();
$newArr = array_reduce($result, function($carry, $item){
    $carry[] = [
        "id" => $item['id'],
        "name" => $item['name'],
        "status" => $item['status'],
    ];
    return $carry;
});

$array_a = ['a','b','c','d'];
$array_b = ['e','f','a','g'];
$result_a = array_intersect($array_a, $array_b); // Output : array('a');
$result_b = array_diff($array_a, $array_b);  // Output : array('b','c','d');