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getTimeFromNTPServer - PHP
<?php
/**
* This function is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This Software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this function; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
**/
/**
*
* Connect to a timeserver and return formatted timestring.
*
* @param string $server The timeserver to query
* @param string $dateformat The dateformat for returning the time
* @return string
*
*/
function getTimeFromNTPServer($server='0.de.pool.ntp.org',$dateformat="Y-m-d H:i:s")
{
$_adjustment = 0;
$_data =null;
$_fp = fsockopen($server, 37, $_errno, $_errstr, 30);
if (!$_fp)
{
die( "$server: $_errstr ($_errno)");
}
else
{
while (!feof($_fp))
{
$_data .= fgets($_fp, 128);
}
fclose($_fp);
if (strlen($_data) != 4)
{
die("NTP Server {$server} gab ungueltige Antwort zurueck.");
}
}
$_ntpTime = ord($_data{0})*pow(256, 3) + ord($_data{1})*pow(256, 2) + ord($_data{2})*256 + ord($_data{3});
$_from1990 = $_ntpTime - 2840140800;
$_timeNow = $_from1990 + 631152000;
$_time = date($dateformat, $_timeNow + $_adjustment);
return $_time;
}
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