Javascript 确定当前环境和请求来源-需要定义变量

除了最后一个变量$currentEnv='？？？'之外，我几乎完成了所有代码。如何使用此语法检测当前环境

/**
     * CORS Implementation to support AJAX requests from mobile site
     * @see http://en.wikipedia.org/wiki/Cross-origin_resource_sharing
     */
    // Define allowed origins per environment
    $allowedOrigins = array(
        'prod' = array(
            'http://m.site.com'
          , 'https://m.site.com'
        )
      , 'staging' = array(
            'http://stg-m.site.com'
          , 'https://stg-m.site.com'
        )
      , 'qa' = array(
            'http://qa-m.site.com'
          , 'https://qa-m.site.com'
        )
    );

    // Determine the current environment and requesting origin
    $httpOrigin = $_SERVER['HTTP_ORIGIN'];
    $currentEnv = "prod"; **// Something that determines the environment...**

    // Allow only if all points match
    if ( isset($allowedOrigins[$currentEnv])
      && in_array($httpOrigin, $allowedOrigins[$currentEnv])
    ){
      header("Access-Control-Allow-Origin: $httpOrigin");
      header("Access-Control-Allow-Methods: POST, GET");
    }

---

我不敢相信我以前没有想到这个。。。解决方案：

/**
* CORS Implementation to support AJAX requests from mobile site
* @see http://en.wikipedia.org/wiki/Cross-origin_resource_sharing
*/
// Define allowed origins per environment
$allowedOrigins = array(
    'prod' = array(
        'http://m.site.com'
      , 'https://m.site.com'
    )
  , 'staging' = array(
        'http://stg-m.site.com'
      , 'https://stg-m.stie.com'
    )
  , 'qa' = array(
        'http://qa-m.site.com'
      , 'https://qa-m.site.com'
    )
);

// Determine the current environment and reqesting origin
switch( $_SERVER['SERVER_NAME'] )
{
  case 'site.com': // fall-thru
  case 'www.site.com':
    $currentEnv = 'prod';
    break;
  case 'stg.site.com':
    $currentEnv = 'staging';
    break;
  case 'qa.site.com':
    $currentEnv = 'qa';
    break;
  default:
    $currentEnv = 'unknown';
}
$httpOrigin = $_SERVER['HTTP_ORIGIN'];

// Allow only if all points match
if ( isset($allowedOrigins[$currentEnv])
  && in_array($httpOrigin, $allowedOrigins[$currentEnv])
){
  header("Access-Control-Allow-Origin: $httpOrigin");
  header("Access-Control-Allow-Methods: POST, GET");
}

---

解决了

总的来说，应该有更好的方法来做到这一点，但问题是：

$httpOrigin = $_SERVER['HTTP_ORIGIN'];

foreach($allowedOrigins as $env => $url) {
    if(in_array($httpOrigin, $url)) {
        $currentEnv = $env;
        break;
    }
}

---

当前的环境、发展、生产情况如何？谁定义了这个，它应该从哪里来？我正在配置它，这样我只需要在三个代码库中包含一个函数，它将在头中返回原点。我可以简单地将原点定义为“”，但我希望使用一个var来检测环境并根据哪个主机创建它