settings-compat-helper.php

<?php
class FLExampleModule extends FLBuilderModule {

	public function __construct() {
		parent::__construct( array(
			'name'        => 'Example',
		) );
	}

	public function filter_settings( $settings ) {

		/**
		 * Convert an old setting to a new setting.
		 * Don't forget to unset the old setting!
		 */
		if ( isset( $settings->old_setting ) ) {
			$settings->new_setting = do_something_with_old_setting( $settings->old_setting );
			unset( $settings->old_setting );
		}

		/**
		 * Change an existing setting.
		 */
		if ( isset( $settings->existing_setting ) ) {
			$settings->existing_setting = do_something( $settings->existing_setting );
		}

		/**
		 * Always return the settings when you are done.
		 */
		return $settings;
	}
}