yii2 open session
use yii\web\Session; $session = Yii::$app->session; // check if a session is already open if ($session->isActive) ... // open a session $session->open(); // close a session $session->close(); // destroys all data registered to a session. $session->destroy(); 设置session $session = Yii::$app->session; $session->set('user_id', '1234'); //OR $session['user_id'] = '1234'; //OR $_SESSION['user_id'] = '1234'; 读取session $session = Yii::$app->session; $user_id = $session->get('user_id'); //OR $user_id = $session['user_id']; //OR $user_id = isset($_SESSION['user_id']) ? $_SESSION['user_id'] : null; Destroy session $session = Yii :: $app -> session ; $session -> remove ( ' user_id ' ) ; // OR unset ( $session [ ' user_id ' ] ) ; // OR unset ( $_SESSION [ ' user_id ' ] ) ; read and set the array session $session = Yii :: $app ->session; $session['user'] = [ 'id' => 1, 'username' => 'yiiuser', ]; echo $session['user']['id']; echo $session[