I\'ve included the relevent parts of our Yii config file below:
return array( ... \'components\'=>array( \'session\' => array(
For Yii2
This solution after login for session cookies set expire time after 7 days:
'components' => [ 'session' => [ 'class' => 'yii\web\Session', 'cookieParams' => ['lifetime' => 7 * 24 *60 * 60] ],