I made session using zend authentication it works good but my problem is I want to change some property of it from another action in other controller my code is: $auth = Zend_Auth::getInstance(); if($auth->hasIdentity()) { $blogId = new model_blog request; $auth->getIdentity()->user_current_blog = $blogId; print "Current Blog"; print_r($auth->getIdentity()->user_current_blog); } in this action user_current_blog change but in other action it not works!!! where I made a mistake???