What are the best practices for maintaining session IDs in PHP to prevent redirection back to the login form when accessing a secured area from another page?

When accessing a secured area from another page, the session ID might be lost, causing the user to be redirected back to the login form. To prevent this, you can store the session ID in a cookie and check for its presence before redirecting the user. 

// Start the session
session_start();

// Check if session ID is not set in cookie
if (!isset($_COOKIE['PHPSESSID'])) {
    // Set session ID in cookie
    setcookie('PHPSESSID', session_id(), time() + 3600, '/', '', false, true);
}

// Check if user is logged in
if (!isset($_SESSION['user'])) {
    // Redirect to login form
    header('Location: login.php');
    exit;
}

Keywords

session IDs PHP secure area redirection login form

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