MD School - Vinayak Colony, Near Chinkara Canteen, Jhunjhunu Road, Chirawa, Jhunjhunu 333026

Start the Session: Each file starts the session with session_start(). This function must be called before any output is sent to the browser.
Login and Set Session: In index.php, after the user submits the form, a session variable user_id is set and the user is redirected to dashboard.php.
Check Session and Display Session ID: In dashboard.php, the script checks if user_id is set in the session. If not, it redirects to the login page. If the session is valid, it retrieves and displays the session ID and user ID.
Logout and Destroy Session: In logout.php, the session is destroyed and the user is redirected to the login page.

This structure ensures that the session is checked at the start of each script, providing a secure way to manage user sessions.