什么是阻塞fsockopen？ [英] What is blocking fsockopen?

问题描述

在挣扎半天后，我终于设法通过转换这个函数让reCAPTCHA工作：

After struggling for half a day, I finally manage to get reCAPTCHA to work by converting this function:

function _recaptcha_http_post($host, $path, $data, $port = 80) {

 $req = _recaptcha_qsencode ($data);

 $http_request  = "POST $path HTTP/1.0\r\n";
 $http_request .= "Host: $host\r\n";
 $http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
 $http_request .= "Content-Length: " . strlen($req) . "\r\n";
 $http_request .= "User-Agent: reCAPTCHA/PHP\r\n";
 $http_request .= "\r\n";
 $http_request .= $req;

 $response = "";
 if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) ) {
  die ("Could not open socket");
 }

 fwrite($fs, $http_request);

 while ( !feof($fs) )
  $response .= fgets($fs, 1160); // One TCP-IP packet
 fclose($fs);
 $response = explode("\r\n\r\n", $response, 2);
 return $response;
}

到：

function _recaptcha_http_post($host, $path, $data, $port = 80) {
 $req = _recaptcha_qsencode ($data);
 $request = curl_init("http://".$host.$path);

 curl_setopt($request, CURLOPT_USERAGENT, "reCAPTCHA/PHP");
 curl_setopt($request, CURLOPT_POST, true);
 curl_setopt($request, CURLOPT_POSTFIELDS, $req);
 curl_setopt($request, CURLOPT_RETURNTRANSFER, true);

 $response = curl_exec($request);
 return $response;
}

基本上，我有兴趣了解为什么 curl 工作，而 fsockopen 失败，并显示无法打开套接字。非常感谢。

Basically, I am interested to find out why curl works while fsockopen fails with "Could not open socket". Thanks.

此外：已启用套接字支持。

In addition: Sockets Support is enabled.

推荐答案

我可能错了，但在 fsockopen（）中使用 $ port = 80 在 cURL 中，此变量未使用。我尝试通过端口80 而不是端口 443 连接到 SSL ;据我所知， cURL 默认情况下会检查 SSL ，并相应连接。

I might be wrong, but you use $port = 80 in fsockopen() while in cURL case this variable is not used at all. I had same problem when tried to connect to SSL via port 80 instead of port 443; as far as I know, cURL checks SSL by default and connects accordingly.

此外，尝试使用 CURLOPT_VERBOSE 运行 cURL ，以查看它的功能。

Also, try running cURL with CURLOPT_VERBOSE to see what it does.

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