concrete5 Detect Environment

bootstrap.php

<?php
// /application/config/bootstrap/start.php
use Concrete\Core\Application\Application;
/**
 * ----------------------------------------------------------------------------
 * Instantiate concrete5
 * ----------------------------------------------------------------------------
 */
$app = new Application();
/**
 * ----------------------------------------------------------------------------
 * Detect the environment based on the hostname of the server
 * ----------------------------------------------------------------------------
 */
$app->detectEnvironment(function(){
    $request = \Concrete\Core\Http\Request::getInstance();
    if (
        ($request->server->get('HTTP_USER_AGENT') == 'Amazon CloudFront') ||
        ($request->getHost() == 'cdntest.exmple.co.jp')
        ) {
        return 'cdn';
    } else if (
      ($request->getHost() == 'develop.exmple.com')
    ) {
      return 'develop';
});
return $app;