php - 服务器到服务器的实时通信

Question

我有两个基于 LAMP（使用 Drupal CMS）的网站，我想在服务器之间执行通信。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/请求并响应网站 1 客户端。我怎样才能做到这一点 ？是否有任何库或模块可以实现这一目标？我从哪里开始构建这样的功能？

Answer 1

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：你可以让它双向。

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，您就可以构建非常棒的工具：谷歌自己使用这种方式来生成关于 reCAPTCHA 的挑战。

HTTP 处理程序（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.";