public function add_delete_cat()
{
$id = $_POST['id'];
if ($id) {
$category = new Category($id);
$category->delete();
echo '';
return true;
}
$v = $_POST['val'];
$category = new Category();
$category->setCategoryName($v);
$id = $category->writeData();
$return['id'] = $id;
$return['v'] = $v;
echo json_encode($return);
}
