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我一直在尝试遵循在以下位置找到的示例代码：

http://kevin.vanzonneveld.net/techblog/article/make_ssh_connections_with_php/

我能够连接到我的交换机，并成功进行身份验证。但是当我尝试运行命令时，它会失败，并在这篇文章的标题中显示错误消息。

      if (!function_exists("ssh2_connect")) die("function ssh2_connect doesn't exist");
          // log in at server1.example.com on port 22
         if(!($con = ssh2_connect("10.14.123.12", 22))){
            echo "fail: unable to establish connection\n";
            } else {
                 // try to authenticate with username root, password secretpassword
                 if(!ssh2_auth_password($con, "root", "mypassword")) {
                          echo "fail: unable to authenticate\n";
                  } else {
                      // execute a command
                      if (!($stream = ssh2_exec($con, "show mac-address" ))) {
                           echo "fail: unable to execute command\n";
                      } else {
                             stream_set_blocking($stream, true);
                             $data = "";
                            while ($buf = fread($stream,4096)) {
                             $data .= $buf;
                      }
                      fclose($stream);
                  }
             }
         }

它在我尝试执行 show mac-address 命令的那一行上快死了。我已经确认这是 switch 命令的正确语法 - 手动尝试过......它返回数据就好了。有什么建议么？谢谢。

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