local-settings.php

<?php
/**
 * Plugin Name: Local Settings
 * Description: Code that should only run in local environment
 * Version:     1.0
 * Author:      Bill Erickson
 * Author URI:  http://www.billerickson.net
 * License:     MIT
 * License URI: http://www.opensource.org/licenses/mit-license.php
 */

/**
 * Media URL
 *
 */
function be_local_media_url( $url ) {
	return 'http://sample.wpengine.com';
}
add_filter( 'be_media_from_production_url', 'be_local_media_url' );