How can cookies and headers impact login functionality in PHP websites?

Cookies and headers play a crucial role in managing user sessions and authentication in PHP websites. Cookies can store session IDs or authentication tokens, while headers can control the redirection after a successful login. To ensure proper login functionality, cookies should be set with secure and httponly flags, and headers should be used to redirect users to the appropriate pages after login. 

// Set a secure and httponly cookie with the session ID
setcookie('session_id', $session_id, time() + 3600, '/', '', true, true);

// Redirect the user to the dashboard page after successful login
header('Location: dashboard.php');
exit();

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cookies headers login functionality PHP websites impact

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