Session time outs and locking on different browsers - php

Question

I have looked through a few previously answered questions, but the solutions don't seem to work for me.
So I have a simple login script that looks like the following:
login.php
// If page requires SSL, and we're not in SSL mode,
// redirect to the SSL version of the page
if($_SERVER['SERVER_PORT'] != 443) {
header("HTTP/1.1 301 Moved Permanently");
header("Location: https://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
exit();
}
// put sha1() encrypted password here
$password = 'sha1passwordgoeshere';
session_start();
if (!isset($_SESSION['loggedIn'])) {
$_SESSION['loggedIn'] = false;
}
if (isset($_POST['password'])) {
if (sha1($_POST['password']) == $password) {
$_SESSION['loggedIn'] = true;
} else {
$logFailure = true;
}
}
if (!$_SESSION['loggedIn']):
// Load Login Page
exit();
endif;
logout.php
// If page requires SSL, and we're not in SSL mode,
// redirect to the SSL version of the page
if($_SERVER['SERVER_PORT'] != 443) {
header("HTTP/1.1 301 Moved Permanently");
header("Location: https://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
exit();
}
// Initialize the session.
// If you are using session_name("something"), don't forget it now!
session_start();
// Unset all of the session variables.
$_SESSION = array();
// If it's desired to kill the session, also delete the session cookie.
// Note: This will destroy the session, and not just the session data!
if (ini_get("session.use_cookies")) {
$params = session_get_cookie_params();
setcookie(session_name(), '', time() - 42000,
$params["path"], $params["domain"],
$params["secure"], $params["httponly"]
);
}
// Finally, destroy the session.
session_destroy();
The rest of my pages include login.php at the top of the file.
All seems to work fine, most of the time. However, I have been noticing since I have moved over to a new server, and using php 5.6.14 that I have been getting timed out from time to time.
For example, right now I can login with Internet Explorer, but I can't with Firefox or Chrome. If I clear cookies, I can then login with Firefox and Internet Explorer, but not Chrome.
UPDATE
I can cause a timeout immediately by logging in successfully, logging out immediately, then logging in again. On the second login, it times out.
It is really been frustrating me, and I am not a session guru, so I don't understand why it is acting in this way, or how to fix it so that it isn't so delicate.
I am only using sessions to record the login, and not for anything else. I do use AJAX on certain pages within the site, but not often.
Basically, I never want this to time out. How would I prevent these time outs from happening?

Answer 1

I have fixed the issue. First, I had used a form button on the log out page to allow a user to log back in. I replaced that with a standard link.
Second, after login, the landing page had a section of code that would create error warnings on the log file with a foreach expecting an array (even though it was an array and outputted properly). Removing that section of code seems to have fixed the issue. I am not sure how this would cause problems.