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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