Session

<?
    if(!session_id()){session_start();}	
    if($_SESSION["username"] == "") {
         header("Location:http://www.website.be/login");
         exit();
    }
?>

<?
    if(!session_id()){session_start();}	
    if($_SESSION["username"] == "") {
         header("Location:http://www.website.be/login");
         exit();
    }
?>

<?php

session_start();

if (!isSet($_SESSION['username']) || trim($_SESSION['username']) == '')
{

header('Location: http://website.be/login');
exit;

}

?>

<?php
 
session_start();
 
if (!isSet($_SESSION['username']) || trim($_SESSION['username']) == '')
{
 
header('Location: http://website.be/login');
exit;
 
}
 
?>