从DNS获取IP而不使用gethostbyname？ [英] Get IP from DNS without using gethostbyname?

问题描述

PHP的 gethostbyname（）函数似乎不可配置就超时而言。我想将DNS请求限制在1秒以内，再显示一个问题，应该被忽略。

PHP's gethostbyname() function doesn't seem to be configurable as far as timeouts are concerned. I want to limit DNS requests to 1 second or less as anymore shows a problem and should be ignored.

那么有没有办法使用套接字进行DNS查询cURL代替？我能够使用保存服务器资源的PHP流程发出SMTP请求，所以我正在寻找与DNS查询相同的方法。

So, is there a way to make a DNS query using sockets or cURL instead? I was able to make SMTP requests using PHP streams which saved server resources, so I'm looking to do the same with DNS queries.

推荐答案

对 PHP文章的评论有一些设置/包含的选项超时：

The comments on the PHP article have some options for setting/including a timeout:

<?php
function getAddrByHost($host, $timeout = 3) {
   $query = `nslookup -timeout=$timeout -retry=1 $host`;
   if(preg_match('/\nAddress: (.*)\n/', $query, $matches))
      return trim($matches[1]);
   return $host;
}
?>

http://www.php.net/manual/en/function.gethostbyname.php#92870

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