Are there any best practices for maintaining session security while accessing sensitive information on external websites using PHP?

When accessing sensitive information on external websites using PHP, it is crucial to maintain session security to prevent unauthorized access. One best practice is to use HTTPS to encrypt data transmitted between the client and server. Additionally, always validate and sanitize user input to prevent SQL injection and other security vulnerabilities. Finally, consider implementing measures such as CSRF tokens to prevent cross-site request forgery attacks.

// Set session cookie parameters for secure transmission
session_set_cookie_params([
    'secure' => true,
    'httponly' => true,
    'samesite' => 'Strict'
]);

// Start secure session
session_start();

// Validate and sanitize user input
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
$password = filter_var($_POST['password'], FILTER_SANITIZE_STRING);

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