Difference between #2 and #1 of Define general array and variable and call it to anywhere in application

Create param.php file in protected/config
~~~
[php]
Yii::app()->params['TEXT_ACTIVE'] = 'Active'; //1 for active

Yii::app()->params['AD_LAYOUT_POISITION'] = array(
													"1"	"1" => array(
																	'width'
		'width' => '1000', 
																	'height'
		'height' => '150'
																),
													"2"
	),
	"2" => array(
																	'width'
		'width' => '200',
																	'height'
		'height' => '150'
																),
													"3"
	),
	"3" => array(
																	'width'
		'width' => '1000',
																	'height'
		'height' => '150'
																),
													"4"
	),
	"4" => array(
																	'width'
		'width' => '200',
																	'height'
		'height' => '150'
																),
																												
													);
	),
);
~~~

Now include this file in protected/config/main.php
~~~
[php]
require_once( dirname(__FILE__) . '/params.php');
return array(
	'basePath'=>dirname(__FILE__).DIRECTORY_SEPARATOR.'..',
         ....
~~~

Now suppose I have to call  TEXT_ACTIVE I will write in my file as

~~~
[php]
echo Yii::app()->params['TEXT_ACTIVE'];

~~~