Question

How to add extensions that developed as modules in yii?
can any one explain extensions as Yii modules and extensions as Yii behavior

Refer

Answer 1

The first part of your Q is a duplicate with this q: https://stackoverflow.com/questions/12008314/modules-in-yii-explain

regarding the “How to Use Modules” part. Modules are may be the easiest way there to extend yii, since all you need to do is two tiny steps:

1. Extract the code under base directory /protected/modules.
2. Declare the used module in the application configuration:

return array(
  ...
  'module' => ('moduleName', 'some argument', 'another argument'),
  ...
);

I haighly recommend taking a look at the docs above then User-Module (as code sample) to get a better understanding to yii modules.

As for “Extending Yii by Behaviors“, i have been confused myself for a while about that, until i had a chance to use the Multi-Lingual_Behavior

There is no typical way for extending Yii with behaviors, simply because there are multiple options (as you can see in the docs here & here) for using (attaching) behaviors to components (application, models, controllers, …etc)

That said, most of yii-extensions there are supported with good Usage docs that are enough in most cases to get them working.