PHP如何基于会话显示页面？

Question

I am making a website. Most of it is available to anybody visiting the site, but a small portion of it requires you to register to view. I have set up the login with Sessions. After someone logs in, it sets this:

$_SESSION['login'] = TRUE;

In one of the exclusive pages, at the top of the code before the content, I have written

if ($_SESSION['login'] == FALSE) {
    header("loginpage.php");
}

However, if somebody is not logged in, that variable does not exist, and I end up with an error. Is there any other way to check if somebody is logged in? I would like something similar to what I already have, because I don't want to have to change everything.

Answer 1

if(!@$_SESSION['login'])
{
  header("location: logingpage.php");
  exit();
}