What considerations should be made for compatibility when implementing session security measures in PHP, especially for users with disabled JavaScript?

When implementing session security measures in PHP, it's important to consider compatibility for users with disabled JavaScript. One way to ensure compatibility is to rely on server-side validation and security measures rather than client-side scripts. This can include using PHP sessions, implementing CSRF tokens, and properly sanitizing and validating user input.

// Start a secure session
session_start();

// Generate a CSRF token
$csrf_token = bin2hex(random_bytes(32));
$_SESSION['csrf_token'] = $csrf_token;

// Validate CSRF token on form submission
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (!hash_equals($_SESSION['csrf_token'], $_POST['csrf_token'])) {
        // Invalid CSRF token, handle error
    } else {
        // Proceed with form submission
    }
}