echo $category->removeMainCategory(); } break; case 'addSubCategory': # code... $mainCategory = new MainCategory(); $mainCategory->type = $_POST['typeMain']; $result = $mainCategory->getIdCategory(); $cat_id = $result['id']; $subCategory = new SubCategory(); $subCategory->category_id = $cat_id; $subCategory->type = $_POST['typeSub']; $data = $subCategory->if_exist(); if ($data == 0) { // not found echo $subCategory->insertSubCategory(); } break; case 'editSubCategory': # 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']; $subCategory->type = $_POST['typeSubNew'];