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Behaviors & events

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Behaviors & events

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[...]
For example, [enabling gzip](http://www.yiiframework.com/doc/cookbook/39/) compression on the output could be done via extending CWebApplication. But because there are entry points for event handlers, one can do this:


```php
Yii::app()->onbBeginRequest = create_function('$event', 'return ob_start("ob_gzhandler");'), Yii::app()->oneEndRequest = create_function('$event', 'return ob_end_flush();'),
```
[...]
```

So, basically, it allows you to build a list of function calls that can later be executed, in the order they were added. It can save you passing around a lot of object refs and building conditional code, since you can still raise the event, even if it doesn't do anything.

##Behaviors
[...]
In an OO language like Ruby, it's quite possible to start with an completely empty object and simply build its behavior as you go along. Yii provides this behavior with a little magic. The key is that the class you wish to add the behavior from must extend Cbehavior.
[...]
So, in this case, you are extending the functionality of an object with functionality of another object.

After studying this cookbook page it isyou are encouraged to reread the [corresponding guide page](http://www.yiiframework.com/doc/guide/basics.component) as it contains advanced information (for example, if you are familiar with interfaces, you might find it enough to implement IBehavior before extending CBehavior).
 
 
- Russian version: [Поведение и события](http://phptime.ru/blog/yii/31.html)
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Version: 1.1
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Written by: pestaa
Last updated by: Gismo
Created on: Aug 24, 2009
Last updated: 11 years ago
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