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Here are all wiki articles from "Understanding" series by Yii wiki contributors:

When you define or extend a class, you can create class variables and methods in Yii just like you can in any other PHP system:

Many Yii users ask how to create helper classes and functions, and though there are numerous approaches spread out among the forum and wiki articles, this Tutorial tries to bring it all together in one place.

Many newcomers to Yii ask about the assets/ directory found under the webroot, and this article means to explain why it's there and how to work with it.

While there is a reasonable amount of documentation regarding CForm (form builder) and file uploads seperately, there really is not any coverage of both in combination.

Unfortunately Sebastian Bergmann decided to remove PHPUnit_Story from future PHPUnit versions. Thanks to elvan for pointing me to the relevant comment. As an alternative Behat has been suggested but it seems too bloated for me TBH. There is also PHPSpec but it's non flexible enough for me and tightly bound with English language (What's the purpose of using DSL if customers can't speak English). Since both frameworks are quite young I think I'll just stick to PHPUnit and see what's going on on the BDD frameworks arena. Even PHPUnit_Story parts of this entry are going to be deprecated soon, rest is still valid! When doing TDD, please write tests with design and behaviour of application in mind instead of testing single functions.

Missed of autocomplete in bash console commands yii make me sad.

I would like to provide you a quick tip on how to implement user level access to your Yii applications.

Functional Testing in Yii using Goutte and PHPUnit

Original source code and idea are from: PHP, PDO & Nested Transactions.