note 114315 added to function.session-is-registered

I can not get the following code to work as it is returning an error on the session_is_registered() and do I have to change anything else in the code Thank you if(!session_is_registered('user_name')){ if (isset($_POST['username'])) { $password1 = clean($_POST["password"]); $username1 = clean($_POST["username"]); $password2 = crypt($password1); $result = @mysql_query ("select * from users where user_name = '".$username1."'"); $lim = @mysql_num_rows( $result ); //|| (strlen($username1) < 6) || (strlen($password1) < 6) if( ($lim!=0) ){ $row = @mysql_fetch_array($result); $password=$row['user_password']; if (crypt($password1, $password) == $password){ $sql = @mysql_query ("insert into logs (ip, cdate, status) values ('".$REMOTE_ADDR."','". date("Y-m-d H:i:s") ."', 'Login')"); session_register('user_id'); session_register('user_fullname'); session_register('user_name'); $_SESSION['user_name'] = $row['user_name']; $_SESSION['user_fullname'] = $row['user_fullname']; $_SESSION['user_id'] = $row['user_id']; }//if crypt else{ ---- Server IP: 72.52.91.14 Probable Submitter: 72.52.91.14 ---- Manual Page -- http://php.net/manual/en/function.session-is-registered.php Edit -- https://master.php.net/note/edit/114315 Del: integrated -- https://master.php.net/note/delete/114315/integrated Del: useless -- https://master.php.net/note/delete/114315/useless Del: bad code -- https://master.php.net/note/delete/114315/bad+code Del: spam -- https://master.php.net/note/delete/114315/spam Del: non-english -- https://master.php.net/note/delete/114315/non-english Del: in docs -- https://master.php.net/note/delete/114315/in+docs Del: other reasons-- https://master.php.net/note/delete/114315 Reject -- https://master.php.net/note/reject/114315 Search -- https://master.php.net/manage/user-notes.php