What is the difference between session_destroy() and unsetting individual session variables in PHP?

The main difference between session_destroy() and unsetting individual session variables in PHP is that session_destroy() completely destroys all session data, while unsetting individual session variables removes only specific data. If you want to clear all session data, use session_destroy(). If you want to remove specific session variables, use unset().

// Using session_destroy() to completely destroy all session data
session_start();
session_destroy();

// Using unset() to remove specific session variables
session_start();
unset($_SESSION['variable_name']);