我希望得到一个PHP脚本，可以检测一个IP地址和端口号(ip:port)的可用性。我找到了一个类似的脚本，但它只能用于网站，不能用于ip:port。
<?php
function ping($host, $port, $timeout)
{
$tB = microtime(true);
$fP = fSockOpen($host, $port, $errno, $errstr, $timeout);
if (!$fP) { return "down"; }
$tA = microtime(true);
return round((($tA - $tB) * 1000), 0)." ms";
}
//Echoing it will display the ping if the host is up, if not it'll say "down".
echo ping("www.google.com", 80, 10);
?>
我想用于游戏服务器。
我的想法是，我可以输入IP地址和端口号，然后获取ping响应。
我认为这个问题的答案基本上概括了你的问题所在。
If what you want to do is find out whether a given host will accept TCP connections on port 80, you can do this:
$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);For anything other than TCP it will be more difficult (although since you specify 80, I guess you are looking for an active HTTP server, so TCP is what you want). TCP is sequenced and acknowledged, so you will implicitly receive a returned packet when a connection is successfully made. Most other transport protocols (commonly UDP, but others as well) do not behave in this manner, and datagrams will not be acknowledged unless the overlayed Application Layer protocol implements it.
The fact that you are asking this question in this manner tells me you have a fundamental gap in your knowledge on Transport Layer protocols. You should read up on ICMP and TCP, as well as the OSI Model.
此外，这是一个针对主机进行基本ping测试的稍微更简洁的版本。
// Function to check response time
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 $status;
}
如果OP确实想要一个ICMP-Ping，那么在socket_create()[链接]的用户贡献笔记中有一些提议可以使用原始套接字（raw sockets）。请注意，在类UNIX系统上需要root权限。
更新：请注意，usec参数在Windows系统中没有作用。最小超时时间为1秒。
无论如何，这是得票最高的ping函数的代码：
function ping($host, $timeout = 1) {
/* ICMP ping packet with a pre-calculated checksum */
$package = "\x08\x00\x7d\x4b\x00\x00\x00\x00PingHost";
$socket = socket_create(AF_INET, SOCK_RAW, 1);
socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array('sec' => $timeout, 'usec' => 0));
socket_connect($socket, $host, null);
$ts = microtime(true);
socket_send($socket, $package, strLen($package), 0);
if (socket_read($socket, 255)) {
$result = microtime(true) - $ts;
} else {
$result = false;
}
socket_close($socket);
return $result;
}
测试不同的端口：
$wait = 1; // wait Timeout In Seconds
$host = 'example.com';
$ports = [
'http' => 80,
'https' => 443,
'ftp' => 21,
];
foreach ($ports as $key => $port) {
$fp = @fsockopen($host, $port, $errCode, $errStr, $wait);
echo "Ping $host:$port ($key) ==> ";
if ($fp) {
echo 'SUCCESS';
fclose($fp);
} else {
echo "ERROR: $errCode - $errStr";
}
echo PHP_EOL;
}
// Ping example.com:80 (http) ==> SUCCESS
// Ping example.com:443 (https) ==> SUCCESS
// Ping example.com:21 (ftp) ==> ERROR: 110 - Connection timed out
function ping($ip){
$output = shell_exec("ping $ip");
var_dump($output);
}
ping('127.0.0.1');
更新： 如果您传递了硬编码的 IP（就像本示例和大多数真实情况一样），则该函数可能已足够。
但由于一些用户似乎非常关注安全，请记住永远不要将用户生成的输入传递给shell_exec 函数：
如果IP来自不受信任的源，则至少在使用之前通过过滤器进行检查。
试试这个：
echo exec('ping -n 1 -w 1 72.10.169.28');
在 UNIX 系统中运行 socket_create 需要使用 root 权限；
$socket = socket_create(AF_UNIX, SOCK_STREAM, 0);
你不需要使用任何exec或shell_exec的技巧来完成这个任务，PHP是可以实现的。Kevin Schroeder的书《You want to do WHAT with PHP?》展示了如何实现。
它使用套接字和pack()函数，该函数允许您读取和写入二进制协议。您需要做的是创建一个ICMP数据包，可以使用“CCnnnA*”格式来创建您的数据包。