session checker

<?
session_start();



$GLOBALS["Index"] = "/Login/";
$GLOBALS["Landing"] = "/Landing/";

$SessionStatus = session_status();

if ($SessionStatus == PHP_SESSION_NONE){
    echo "None";
    Out();
}else if ($SessionStatus == PHP_SESSION_DISABLED){
    echo "Disabled";
    Out();
}else if($SessionStatus == PHP_SESSION_ACTIVE){
    if ((isset($_SESSION["Username"]))){
        if ($Window == 'Index'){
            header("Location: " . $GLOBALS["Landing"]);
        }
        if ($Window == "Landing" && $_SESSION["Username"] == "FileUpload"){
            out();
        }
    }else if ($Window == "Index"){
        //session_reset();
    }else{
        echo "error";
        echo var_dump($_SESSION);
        echo "out";
        out($Window);
    }
}

function Out($Window){
    //session_destroy();
    echo $Window;
    if ($Window != "Index"){
        header("Location: " . $GLOBALS["Index"]);
    }
    exit;
}

?>