How can I install a yii extension, making it available to my whole web application? - yii

Question

Recently I decided to study php and I discovered yii framework. At first glance it seemed very easy to work with it but now I am struggling to configure my web application for installing an extension to work with Enums. I downloaded this extension from their web site and I put it within extensions folder. The issue is that I am not able to call the subclasses that I created in my code. I created a few classes that extend from this superclass (extension).
Which configuration I must do to make this extension class, available to my web application code?
As I said I just put that extension class in my extensions folder and I am just instantiating them, inside controller's methods. When I run the code I see the same error message no matter any configuration I make:
include (xxx.php): failed to open stream: No such file or directory
If anyone does want to know more about this extension this is the page that shows some information about that.
http://www.yiiframework.com/extension/enum/

Answer 1

in config/main.php you should add your extension details in the components array, something like:
return array(
// 'preload'=>array('xyz',...),
'components'=>array(
'xyz'=>array(
'class'=>'ext.xyz.XyzClass',
'property1'=>'value1',
'property2'=>'value2',
),
// other component configurations
),
);
where xyz is an extension
or just put it in the extensions folder and import it by Yii::import('application.extensions.extensionname.*');