I've read through the example at the top of page 161 several times now, and I just cannot understand it. So I tried out the code, but I cannot get it to work. Here's what I did:
I downloaded the yiibook2_cms.zip file.
I installed it as ullman.local, and verified that it works in my browser (using Xampp on Win 7).
To be clear, the composer.json file is here: E:\xampp\htdocs\ullman\composer.json.
In Sublime Text, I opened SiteController.php, added this code, and saved the file:
[
'page' => ['class' => 'yii\web\ViewAction']
]
As a result, my actions method now looks like this: