！ The same username and password can not be logged backstage

Help! The same username and password can not be logged backstage

Include_once ("conn.php");
Ob_start ();
Session_Start ();

Determine if the administrator logged in
if ($_session[' userName ') && $_session[' is_admin '] = = ' Y ') {
?>

 
 } else {
echo "Sorry, you do not have the right to access this page";
echo "Back to Background landing page";
}
Ob_end_flush ();
?>

The user password is the same as the database, the permission is also the administrator, the Welcome page has been jumping to "no access to this page" page

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------Solution--------------------
I don't know how your $_session[' is_admin ' is assigned.

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