用这种方法不仅优雅,而且是最准确.像自己根据响应的换行去分隔会有不准确的情况发生.

$headers = [];
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

// this function is called by curl for each header received
curl_setopt($ch, CURLOPT_HEADERFUNCTION,
  function($curl, $header) use (&$headers)
  {
    $len = strlen($header);
    $header = explode(':', $header, 2);
    if (count($header) < 2) // ignore invalid headers
      return $len;

    $headers[strtolower(trim($header[0]))][] = trim($header[1]);

    return $len;
  }
);

$data = curl_exec($ch);
print_r($headers);

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