完全披露:有一个类似的问题here。
有什么方法可以测试特定端口是否使用PHP正确打开和转发?具体来说,我如何使用套接字连接到给定端口的给定用户?
此示例位于WhatsMyIP.org/ports的“自定义端口测试”部分。
答案 0 :(得分:75)
我不确定你被“正确转发”是什么意思,但希望这个例子可以解决这个问题:
$host = 'stackoverflow.com';
$ports = array(21, 25, 80, 81, 110, 443, 3306);
foreach ($ports as $port)
{
$connection = @fsockopen($host, $port);
if (is_resource($connection))
{
echo '<h2>' . $host . ':' . $port . ' ' . '(' . getservbyport($port, 'tcp') . ') is open.</h2>' . "\n";
fclose($connection);
}
else
{
echo '<h2>' . $host . ':' . $port . ' is not responding.</h2>' . "\n";
}
}
输出:
stackoverflow.com:21 is not responding.
stackoverflow.com:25 is not responding.
stackoverflow.com:80 (http) is open.
stackoverflow.com:81 is not responding.
stackoverflow.com:110 is not responding.
stackoverflow.com:443 is not responding.
stackoverflow.com:3306 is not responding.
有关端口号的完整列表,请参阅http://www.iana.org/assignments/port-numbers。