echo "Data updated"; } break; case 'removeSubCategory': # code... $category = new MainCategory(); $category->type = $_POST['typeMain']; $result = $category->getIdCategory(); $subCategory = new SubCategory(); $subCategory->category_id = $result['id']; $subCategory->type = $_POST['typeSub']; $result = $subCategory->getSubCatId(); if ($result['id'] != 0) { //found $subCategory->id = $result['id']; echo $subCategory->removeSubCategory(); echo "Data removed"; } break; case 'listCategory': # code... $mainCategory = new MainCategory(); $data = $mainCategory->getMainCategory(); echo json_encode($data); break; case 'listSubCategory': # code... $mainCategory = new MainCategory(); $mainCategory->type = $_POST['type']; $result = $mainCategory->getIdCategory(); $cat_id = $result['id'];