ZF2 sessions arrays

    public function firstAction()
    {
        $container = new Container('myContainer');
        $container->my_data = array();
        $container->my_data['key_name'] = "any data";
        return array(
        'message' => 'key_name persisted in my_data array',
    );
    }

    public function secondAction()
    {
    $lastContainer = new Container ( 'myContainer' );
    if ($lastContainer->offsetExists ( 'my_data' )) {
        $myData = $lastContainer->offsetGet ( 'my_data' );
        if (array_key_exists ( 'key_name', $myData )) {
            unset (  $myData ['key_name'] );
            $lastContainer->my_data = $myData;
            $result = 'key_name unseted !!';
        } else {
            $result = 'my_data array was SET but key_name was Not SET !! ';
        }
    } else {
        $result = 'NO key_name found !!!';
    }
    return array (
            'result' => $result
    );
    }