使用fsockopen（）与服务器的连接保持打开状态； 在PHP中检查其状态

Question

I've been coding up a quick web app to check the status of all the different dedicated server processes I run on my multi-purpose server. I'm using fsockopen to check the ports, and it's doing what I need it to do in that it's returning whether there is a service running on those ports, but it seems to be leaving the connections open. One specific instance is my Mumble server. Every time I run the script, it returns that my mumble server is online but the connection it opens with fsockopen is adding to the user count. It can keep going until it reaches the max user count and then will refuse connections from actual mumble clients as well as further attempts to check it with fsockopen . The same happens when running my server for Terraria. Eventually, after probably at least an hour, the user count on my mumble server is resetting but I'm not certain if it is the connections closing or the server crashing and restarting.

Here's the code I'm using to check the ports and display on the page their status:

function serverPort($port, $service) {
    $fp = @fsockopen("192.168.1.xxx", $port, $errno, $errstr, 3);
        if($fp) {
            $color = "green";
            echo "<span style='font:12px/0px monospace'><b>$service</b></span>".
            spacer($service)."<span style='font:12px/0px monospace'> | 
            <b><font color=$color>online</font></span></b>\n";
            fclose($fp);
        } else {
            $color = "red";
            echo "<span style='font:12px/0px monospace'><b>$service</b></span>".
        spacer($service)."<span style='font:12px/0px monospace'> | 
        <b><font color=$color>offline</font></span></b>\n";
        fclose($fp);
        }
    stream_set_timeout($fp, 1);
    fclose($fp);
    $fp = null;

    echo "</br>";
}

I've got a function called in this code for dynamic spacing ( spacer(); ) on the output strings that is defined in the actual script prior to the function detailed here. It's not relevent to the problem but I've left it in there to reduce confusion on my own part.

As you can see near the end there I've tried three separate methods I've come across that I was under the impression were meant to close the connections but none of them have achieved the desired result. I'm relatively new to PHP in that I haven't touched it since probably '04, same for HTML, so anything helps at this point.

Also, for reference, I've tried socket_create and socket_close together separately from fsockopen and it wouldn't even echo my intended results.

Edit: And if anyone is curious, this is what it looks like: http://i.imgur.com/C9O3SMq.png

It's completely functional, it's just the issue of the connections remaining open I need solved.

Answer 1

found on php.net ( http://php.net/manual/en/function.fclose.php )

It is very important to make sure you clear any incoming packets out of the incoming buffer using fread() or some equivalent. Although you can call fclose() the socket does not actually shut down until the inbound packets have been cleared. This can lead to some confusion.

and

In case you have some trouble to properly disconnect some client streams opened with stream_socket_server / stream_select you should give a try to stream_socket_shutdown.

<?php stream_socket_shutdown($clientStream,STREAM_SHUT_RDWR); ?>