如何使用 PHP Ping 服务器端口？

Pinging a Server Port with PHP

In PHP, you can utilize the fsockopen() function to check whether a server accepts TCP connections on a specified port. Here's how:

$host = '193.33.186.70';
$port = 80;
$waitTimeoutInSeconds = 1;
if($fp = fsockopen($host,$port,$errCode,$errStr,$waitTimeoutInSeconds)){
   // It worked
} else {
   // It didn't work
}
fclose($fp);

This script will determine if the server at the given IP address is accepting HTTP connections on port 80.

Note: This approach is specific to TCP connections. Other protocols like UDP have different characteristics that require more complex pinging mechanisms.

Customized Pinging

If you require more specific pinging capabilities, consider the following script:

function pingDomain($domain){
    $starttime = microtime(true);
    $file      = fsockopen ($domain, 80, $errno, $errstr, 10);
    $stoptime  = microtime(true);
    $status    = 0;

    if (!$file) $status = -1;  // Site is down
    else {
        fclose($file);
        $status = ($stoptime - $starttime) * 1000;
        $status = floor($status);
    }
    return $status;
}

This script provides a ping response in milliseconds, indicating the server's latency. You can use this script to monitor game server availability and response times.

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