Erro Fatal

[John Lopes 2]

<?php
include("program_files/config.php");
include("language/{$PHPFFL_DEFAULT_LANGUAGE_DIR}/login.php");
$Mode=$_REQUEST['Mode'];
Switch($Mode)
{
    case "confirm_login":
        $Username=$_REQUEST['Username'];
        $Password=$_REQUEST['Password'];
        $Remember_Me=$_REQUEST['Remember_Me'];
        if(1)
        {
            $Username=addslashes($Username);
        }
        $encrypted_password=md5($Password);
        $sql="select ID, leagues_ID from users where username='$Username' and password='$encrypted_password';";
        $rs=$DB->Execute($sql);
        if(!($rs->EOF))
        {
            if($Remember_Me==1)
            {
                setcookie("Remember_User",$Username, time()+60*60*24*1000);
                setcookie("Remember_Pass",$Password, time()+60*60*24*1000);
            }
            $users_ID=$rs->fields("ID");
            $ip = getenv('REMOTE_ADDR');
            $current_date=gmdate("Y-m-d H:i:s");
            $sql="insert into users_login_log (users_ID, login_date, login_ip) values ('$users_ID', '$current_date', '$ip');";
            $DB->Execute($sql);
            session_start();
            session_register('USERSID');
            //$USERSID=$users_ID;
            $_SESSION['USERSID']=$users_ID;
            $sql="select leagues_ID from users_teams, teams where teams.ID=teams_ID and users_ID=$users_ID;";
            $leagues_rs=$DB->Execute($sql);
            $session_name=session_name();
            $session_id=session_id();
            if(!($leagues_rs->EOF))
            {
                $leagues_ID=$leagues_rs->fields("leagues_ID");
                session_register('LEAGUEID');
                $_SESSION['LEAGUEID']=$leagues_ID;
            }
            if(strlen($leagues_ID)>0)
            {
                $sql="select ID from custom_pages where leagues_ID=$leagues_ID and default_login_page=1;";
                $pages_rs=$DB->Execute($sql);
                if(!($pages_rs->EOF))
                {
                    $pages_ID=$pages_rs->fields("ID");
                    session_write_close();
                    header("Location: {$PHPFFL_WEB_ROOT}custom_pages.php?&Pages_ID=$pages_ID&{$session_name}={$session_id}");
                    exit();
                }
                else
                {
                    session_write_close();
                    header("Location: {$PHPFFL_WEB_ROOT}my_team.php?{$session_name}={$session_id}");
                    exit();
                }
            }
            else
            {
                session_write_close();
                header("Location: {$PHPFFL_WEB_ROOT}leagues.php?{$session_name}={$session_id}");
                exit();
            }
        }
    default:
    case "login":
        $File_To_Include="program_files/login.php";
        $Page_Title=LOGIN;
    break;
}
include("template/header.php");
include("template/no_leftnav.php");
include($File_To_Include);
echo "</td></tr></table></td></tr></tbody></table>";
include("template/footer.php");
?>
<script type="text/javascript">
$(document).ready(function() {
   $("#Username").focus();
});
</script>
<?php
?>

Bem estou com esse código que é de um script pronto de Fantasy League. Está dando esse erro quando faço o login, porém como sou iniciante em progamação, não estou conseguindo identificar o erro.

 

( ! ) Fatal error: Call to undefined function session_register() in C:\wamp\www\phpffl_webfiles\login.php on line 36Call Stack#TimeMemoryFunctionLocation10.0020266976{main}( )..\login.php:0

[Gabriel Heming 766]

Está tudo no manual:

 

PHP::session_register();

 

 

Warning

This function has been DEPRECATED as of PHP 5.3.0 and REMOVED as of PHP 5.4.0.