YII session control

{Write}

Yii::app()->session['url']='http://pritomkumar.blogspot.com';
Yii::app()->session->add('author','Pritom Kumar');

{Read}

echo Yii::app()->session['url']; //http://pritomkumar.blogspot.com
echo Yii::app()->session->get('author'); // Pritom Kumar