通过PHP从NTP服务器检索时间 [英] Retrieve Time from NTP server via PHP

问题描述

我的虚拟机(VMWare/Ubuntu)出现了时间同步问题.我们认为最好的办法是直接从NTP服务器获取时间，因此我开始研究脚本来完成此工作，但到目前为止仍无济于事，这就是为什么我决定来这里看看是否有人可以指出我的正确建议方向.

I have an issue with a Virtual Machine (VMWare/Ubuntu) that is getting out of time sync. We decided that the best thing to do was to get the time directly from an NTP server so I started researching a script to do that but nothing works so far, that's why I decided to come here and see if someone can point me in the right direction.

为澄清起见，我正在寻找一种通过PHP连接到Time Server的方法，以直接检索时间并在我需要生成的时间戳上重用该时间，而该时间戳无需同步服务器.

To clarify, I'm looking for a way to connect to a Time Server via PHP to retrieve the time directly and reuse it on a timestamp that I need to generate not to sync the server.

推荐答案

以下是完整的工作代码:

Here's a complete working code:

<?php
error_reporting(E_ALL ^ E_NOTICE);
ini_set("display_errors", 1);

date_default_timezone_set("America/Argentina/Buenos_Aires");

/* Query a time server (C) 1999-09-29, Ralf D. Kloth (QRQ.software) <ralf at qrq.de> */
function query_time_server ($timeserver, $socket)
{
    $fp = fsockopen($timeserver,$socket,$err,$errstr,5);
        # parameters: server, socket, error code, error text, timeout
    if($fp)
    {
        fputs($fp, "\n");
        $timevalue = fread($fp, 49);
        fclose($fp); # close the connection
    }
    else
    {
        $timevalue = " ";
    }

    $ret = array();
    $ret[] = $timevalue;
    $ret[] = $err;     # error code
    $ret[] = $errstr;  # error text
    return($ret);
} # function query_time_server


$timeserver = "ntp.pads.ufrj.br";
$timercvd = query_time_server($timeserver, 37);

//if no error from query_time_server
if(!$timercvd[1])
{
    $timevalue = bin2hex($timercvd[0]);
    $timevalue = abs(HexDec('7fffffff') - HexDec($timevalue) - HexDec('7fffffff'));
    $tmestamp = $timevalue - 2208988800; # convert to UNIX epoch time stamp
    $datum = date("Y-m-d (D) H:i:s",$tmestamp - date("Z",$tmestamp)); /* incl time zone offset */
    $doy = (date("z",$tmestamp)+1);

    echo "Time check from time server ",$timeserver," : [<font color=\"red\">",$timevalue,"</font>]";
    echo " (seconds since 1900-01-01 00:00.00).<br>\n";
    echo "The current date and universal time is ",$datum," UTC. ";
    echo "It is day ",$doy," of this year.<br>\n";
    echo "The unix epoch time stamp is $tmestamp.<br>\n";


    echo date("d/m/Y H:i:s", $tmestamp);
}
else
{
    echo "Unfortunately, the time server $timeserver could not be reached at this time. ";
    echo "$timercvd[1] $timercvd[2].<br>\n";
}
?>

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