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Extending common classes to allow better customization
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[...]
}
```
Note: the common Yii convention is to remove the leading `C` when creating custom classes, by I believe it's more obvious that these are user-defined classes by using the `My` prefix. But choose the convention you prefer.
Note#2: If you're looking at the Blog demo, the application controllers **already** extend from `protected/components/Controller.php`, which is the blog's helper class of this kind - no need to extend it again.
Once these class files have been created, edit each of your controllers and models:
```php
// in protected/controllers/PostController.php
class PostController extends MyController {[...]