php - socket_connect()函数中的问题

Question

// Create a new socket
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

// An example list of IP addresses owned by the computer
$sourceips['kevin']    = '127.0.0.1';
$sourceips['madcoder'] = '127.0.0.2';

// Bind the source address
socket_bind($sock, $sourceips['madcoder']);

// Connect to destination address
socket_connect($sock, $sourceips['madcoder'], 80);

// Write
$request = 'GET / HTTP/1.1' . "\r\n" .
  'Host: example.com' . "\r\n\r\n";
socket_write($sock, $request);

// Close
socket_close($sock);

我收到一个错误

Warning: socket_connect() [function.socket-connect]: unable to connect [0]: A socket operation was attempted to an unreachable host. in C:\wamp\www\sockert\sockert.php on line 13

谢谢，

Answer 1

嗯，看起来您是直接从the PHP reference page for socket_bind()拿了这个示例。另外，我假设您没有更改任何代码，并且没有将计算机设置为127.0.0.2。这是你的问题。

请记住，示例代码只是示例代码。这是一个基于示例代码的工作示例，该示例代码查看一个随机的Google IP。我还添加了socket_read()函数，以便您可以看到返回的一些数据(当然，它的1024个字节)。

    <?php
    // Create a new socket
    $sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

    // An example list of IP addresses owned by the computer
    $sourceips['google'] = '74.125.127.103';

    // Bind the source address
    socket_bind($sock, $sourceips['google']);

    // Connect to destination address
    socket_connect($sock, $sourceips['google'], 80);

    // Write
    $request = 'GET / HTTP/1.1' . "\r\n" .
               'Host: google.com' . "\r\n\r\n";
    socket_write($sock, $request);

    // You'll get some HTTP header information here,
    // and maybe a bit of HTML for fun!
    print socket_read($sock, 1024);

    // Close
    socket_close($sock);
    ?>