OpenCart 3: Persistent Changes Despite Cache Clearing - Exploring Ocmod and Twig Caches

In OpenCart 3, a common issue arises when changes made to the \catalog\controller\product\product.php file fail to reflect on the product details page. After clearing the system cache and refreshing the page, the changes remain absent.

This behavior is attributed to two potential culprits within OpenCart's architecture: ocmod and twig caches.

Ocmod Cache

Ocmod is an OpenCart extension that allows for easy modification of core files without directly editing them. When changes are made to the core files, ocmod creates a cache to streamline subsequent requests. However, if the changes made to the core files are not reflected in the cache, it can lead to the observed issue.

To clear the ocmod cache, follow these steps:

1. Navigate to Extensions > Modifications in your OpenCart admin panel.
2. Click the "Reload" button in the top-right corner.

Twig Cache

Twig is OpenCart's templating engine. It caches compiled templates to improve performance. When changes are made to the templates, the cache may not be automatically updated, resulting in the absence of those changes on the frontend.

To clear the twig cache:

1. From the OpenCart admin panel, click the gear icon in the top-right corner.
2. Select "Settings" and then click "Clear Theme Cache."