How to organize checking for the presence of a controller and an action in Yii?

Question

Yii

When accessing a non-existent url, it gives an error: Page Not Found Unable to resolve the request "xxx".
The question is, if it is possible in yii to make your own check and set the display of the site page instead of an error message? What interests me the most is where this check should be.

Answer 1

If we are talking only about errors, then in the config you write errorHandler

return array(
    …
    'components'=>array(
        'errorHandler'=>array(
            'errorAction'=>'site/error',
        ),
    ),
);

Accordingly, an action called Error from the Site controller will be called, and you can handle this error in any way and display your page.