log_noptin_message( mixed $message, string $code = 'error' )

function log_noptin_message( $message, $code = 'error' ) {

	if ( is_wp_error( $message ) ) {
		$message = $message->get_error_message();
	}

	$message = noptin_clean( $message );

	// Next, retrieve the array of existing logged messages.
	$messages   = get_logged_noptin_messages();

	// Add our message.
	$messages[] = array(
		'level'	=> $code,
		'msg'	=> $message,
		'time'	=> current_time( 'mysql' ),
	);

	// Then save to the database.
	return update_option( 'noptin_logged_messages', $messages );

}