PHP Curl，检索服务器IP地址 [英] PHP Curl, retrieving Server IP Address

问题描述

我使用PHP CURL向服务器发送请求。

I'm using PHP CURL to send a request to a server. What do I need to do so the response from server will include that server's IP address?

推荐答案

此可以

This can be done with curl, with the advantage of having no other network traffic besides the curl request/response. DNS requests are made by curl to get the ip addresses, which can be found in the verbose report. So:

• 开启CURLOPT_VERBOSE。


• 将CURLOPT_STDERR直接指向
  > 使用 preg_match_all（）解析
  资源的字符串内容
  地址


• 响应的服务器地址将
  存储在匹配数组的零键
  子阵列中。


• 提供
  内容的服务器的地址（假设成功的
  请求）可以用
  end（）检索。

• Turn on CURLOPT_VERBOSE.
• Direct CURLOPT_STDERR to a "php://temp" stream wrapper resource.
• Using preg_match_all(), parse the resource's string content for the ip address(es).
• The responding server addresses will be in the match array's zero-key subarray.
• The address of the server delivering the content (assuming a successful request) can be retrieved with end(). Any intervening servers' addresses will also be in the subarray, in order.

演示：

$url = 'http://google.com';
$wrapper = fopen('php://temp', 'r+');
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_STDERR, $wrapper);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
curl_close($ch);
$ips = get_curl_remote_ips($wrapper);
fclose($wrapper);

echo end($ips);  // 208.69.36.231

function get_curl_remote_ips($fp) 
{
    rewind($fp);
    $str = fread($fp, 8192);
    $regex = '/\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b/';
    if (preg_match_all($regex, $str, $matches)) {
        return array_unique($matches[0]);  // Array([0] => 74.125.45.100 [2] => 208.69.36.231)
    } else {
        return false;
    }
}

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