我有两个基于LAMP（使用Drupal CMS）的网站，我想在服务器之间进行通信。例如，网站1上的客户端执行一些活动，数据和内容被传送到网站2，网站2处理数据/请求并回复网站1客户端。我该怎么做？是否有任何库或模块可以实现这一点？我从哪里开始构建这样的功能？
您想要做的事情，可以通过使用POST查询的HTTP协议使用套接字来完成。
例如，有一个从服务器a到服务器B的通信。注意：您可以使其双向。
HTTP查询（客户端）
# the target url (without http://) or address of the remote host
# if the remote address is an ipv6 she must start and end with [] like this [::1].
$http_host = "website1.com"; # api.website1.com or localhost or 13.33.33.37
# The address of the script who's give answer from the root directory "/".
$script_path = "/answer.php";
# The parameters.
$http_params = "cost=156&product=" . urlencode("string must be url encoded");
$http_query = "POST " . $script_path . " HTTP/1.0" . "'r'n";
$http_query .= "Host: " . $http_host . "'r'n";
$http_query .= "Content-Type: application/x-www-form-urlencoded;" . "'r'n";
$http_query .= "Content-Length: ".strlen($http_params) . "'r'n";
$http_query .= "User-Agent: Drupal/PHP" . "'r'n'r'n";
$http_query .= $http_params;
$http_answer = NULL;
if ($socket = @fsockopen($http_host, 80, $errno, $errstr, 10))
{
fwrite($socket, $http_query);
while (!feof($socket))
$http_answer .= fgets($socket, 1024);
fclose($socket);
}
$http_answer = explode("'r'n", $http_answer);
if (is_array($http_answer))
{
echo "<pre>";
print_r($http_answer);
echo "</pre>";
}
只要有一点想象力，你就可以构建非常好的工具：谷歌自己也可以用这种方式在reCAPTCHA上产生挑战。
HTTP HANDLER（服务器）
# if the parameters are matched.
if (isset($_POST['cost'], $_POST['product']))
{
# some treatement on the data
if (is_numeric($_POST['cost']))
echo "The cost were defined to $_POST[cost]" . "'r'n";
else
echo "The cost attribute must be a numerical value." . "'r'n";
if (!is_numeric($_POST['product']))
echo "The product were correctly registered." . "'r'n";
else
echo "The product attribute must be different than a numerical value." . "'r'n";
}
# otherwise the parameters are wrong.
else echo "Something went wrong.";