You can try this code:
public function set($key, $value) { if (is_array($value) && isset($_SESSION[$key]) && is_array($_SESSION[$key])) { $_SESSION[$key] = ArrayHelper::merge($_SESSION[$key], $value); } else { $_SESSION[$key] = $value; } } ... \Yii::$app->session->set('myvar',['subKey' => 'value']);
By:Xtreem Solution
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