如何在用户点击时生成SESSION值

I have a login using sessions. Is there a way to create a new session variable (add it to the existing session) when I click on a link?

我有一个登录的会话,是否有办法在用户点击链接时生成一个会话变量?

解决办法
if (isset($_GET['show'])) {
    $_SESSION['show'] = $_GET['show'];
}