How does the usage of superglobal arrays like $_POST and $_GET compare to the deprecated register_globals in terms of security and efficiency in PHP programming?

Using superglobal arrays like $_POST and $_GET is considered more secure than using the deprecated register_globals in PHP programming. This is because register_globals can lead to security vulnerabilities such as injection attacks, while superglobals provide a safer way to access form data. Additionally, superglobals are more efficient as they do not pollute the global namespace with variables.

// Using $_POST superglobal to access form data securely
$username = isset($_POST['username']) ? $_POST['username'] : '';
$password = isset($_POST['password']) ? $_POST['password'] : '';