How does the PHP configuration setting register_globals affect the usage of session_register()?

When the PHP configuration setting register_globals is enabled, it automatically creates global variables from form input data. This can lead to security vulnerabilities and potential conflicts with session variables. To address this issue, you should avoid using functions like session_register() and instead directly assign values to $_SESSION superglobal array.

// Avoid using session_register() when register_globals is enabled
// Instead, directly assign values to $_SESSION superglobal array

$_SESSION['username'] = 'john_doe';
$_SESSION['email'] = 'john@example.com';