Damian User Check

user_session_check.php

<?php

if (session_status() != PHP_SESSION_ACTIVE)
    session_start();

if ( ! isset($_SESSION['u_email']) ):
    header($_SERVER["SERVER_PROTOCOL"] . "401 Unauthorized");
    header('Location: login.php');
    exit;
endif;

require_once( $basePath . '/includes/user.php');

// Retrieve project object from database
$user   = getUserByEmail($_SESSION['u_email']);

if ($user == FALSE || is_int($user)):
    header($_SERVER["SERVER_PROTOCOL"] . "404 Not Found");
    header('Location: ../404.php');
    exit;
endif;

if ($user->is_admin == 0):
    header($_SERVER["SERVER_PROTOCOL"] . "403 Unauthorized");
    header('Location: ../403.php');
    exit;
endif;