| Situation | Result | |-----------|--------| | One module overrides same class | Works normally. | | Two modules override same class | Only the last installed module’s override will remain. | | Core override + module override | Core override (in /override/ ) wins because it loads first. | | Child theme override of a controller | Works – theme controller overrides are separate (in /theme/modules/ ). |
The moment you update PrestaShop, those changes will be wiped out. Instead, you should use the system. It’s the professional way to extend PrestaShop’s functionality without breaking "upgradeability." What is a PrestaShop Override? prestashop override class
| Original Core Path | Override Path | Class Name (Override) | |-------------------|---------------|------------------------| | /classes/Cart.php | /override/classes/Cart.php | class Cart extends CartCore | | /controllers/front/OrderController.php | /override/controllers/front/OrderController.php | class OrderController extends OrderControllerCore | | /core/Foundation/IoC/Container.php | /override/core/Foundation/IoC/Container.php | class Container extends ContainerCore | | Situation | Result | |-----------|--------| | One
You only need to write the specific function you want to change, not the whole class. How to Override a Core Class (Step-by-Step) Let’s say you want to override the Product class. 1. Create the File | | Child theme override of a controller
| Alternative | When to Use | |-------------|--------------| | (e.g., actionValidateOrder , actionProductSave ) | 80% of cases – modifying data flow without breaking upgrade path. | | Module Controllers (extend ModuleFrontController ) | Adding new pages/endpoints. | | Decorator Pattern (wrap core object in your own class) | Complex logic that needs to be toggled on/off. | | Symfony Event Listeners (PS 1.7+) | Modern, clean approach for the Symfony-based pages. |