Noodle/teacher/goBack.php

<?php
$root = $_SERVER['DOCUMENT_ROOT'];
include($root . "/util/session.php"); //checks that the user is logged in

if (isset($_SESSION['chapterPanel'])) {
    unset($_SESSION['questionAdd']);
    unset($_SESSION['chapterPanel']);
} else if (isset($_SESSION['subjectPanel'])) {
    unset($_SESSION['subjectPanel']);
}
header("location: teacher.php");