yii2 如何开启session

yii2打开session （推荐学习：yii教程）

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;

销毁session

$session = Yii::$app->session; $session->remove('user_id'); //OR unset($session['user_id']); //OR unset($_SESSION['user_id']);

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