[PHP] Re: [Q] PHP 101 -- How to check for session existence?

[Jason Barnett]

Hey Michael, I think you really only need to check the $_SESSION array, 
not necessarily each index.

if (!isset($_SESSION)) {
  // login
  header('Location: ' . MEMBER_LOGIN_PAGE);
} else {
  // session exists
}
However, if you want to have non-empty values for your session variables 
you should use:

if (empty($_SESSION['username'] || empty($_SESSION['session_id']) {
  // session indexes username and / or session_id are empty
  header('Location: ' . MEMBER_LOGIN_PAGE);
}
There is a fine difference between isset() and empty().  Check the 
online manual or this newsgroup for further discussion.

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