public function actionIndex(){
    $session = \YII::$app->session;
    //判斷session是否開啟
    if(!$session->isActive) {
      //未開啟,需要開啟
      $session->open();
    }
    //設(shè)置session
    $session->set('user_name','zhangsan');
    //獲取session
    $user_name = $session->get('user_name');
    echo $user_name;
    //刪除session
    $session->remove('user_name');
    //數(shù)組形式的session
    //設(shè)置session
    $session['userName'] = 'lisi';
    //獲取session
    $user_name = $session['userName'];
    echo $user_name;
    //刪除session
    unset($session['userName']);
}

public function actionIndex(){
    //設(shè)置cookie(注意這里用的是響應(yīng)組件)
    $cookies = \YII::$app->response->cookies;
    $cookie_data = array('name'=>'user','value'=>'zhangsan');
    $cookies->add(new Cookie($cookie_data));
    //獲取cookie(注意這里用的是請求組件)
    $cookie = \YII::$app->request->cookies;
    echo $cookie->getValue('user','default_value');//第二個參數(shù)為不存在時的默認值
    //刪除cookie(注意這里用的是響應(yīng)組件)
    $cookies->remove('user');
}