Are there any best practices for naming session variables in PHP to avoid conflicts or unexpected behavior?

When naming session variables in PHP, it is best practice to prefix them with a unique identifier to avoid conflicts with other variables in the session or unexpected behavior. This can be achieved by using a standardized naming convention, such as prefixing all session variables with "sess_" or a similar identifier.

// Set session variable with unique prefix
$_SESSION['sess_username'] = 'john_doe';

// Retrieve session variable with unique prefix
$username = $_SESSION['sess_username'];