Query NTP time in PHP

ntp.php

<?php
  function ntp_time ($host) {
    $msg = hex2bin('e30004fa000100000001000000000000000000000000000000000000000000000000000000000000');
    $data = false;
    if ($sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP)) {
      if (@socket_connect($sock, $host, 123)) {
        list($xmt['time2'], $xmt['time1']) = explode(' ', microtime());
        $xmt['time1'] += 2208988800;
        $xmt['time2'] *= 4294967296;
        $msg .= pack('N*', $xmt['time1'], $xmt['time2']);
        if (@socket_write($sock, $msg)) {
          if ($recv = @socket_read($sock, 48)) {
            $data = unpack('H2ntp.flags/C1ntp.stratum/C1ntp.ppoll/c1ntp.precision/N1ntp.rootdelay/N1ntp.rootdispersion/H8ntp.refid/N2ntp.reftime/N2ntp.org/N2ntp.rec/N2ntp.xmt', $recv);
            $data['hex'] = bin2hex($recv);
            $data['ntp.rootdelay'] = $data['ntp.rootdelay'] / pow(2, 16);
            $data['ntp.rootdispersion'] = $data['ntp.rootdispersion'] / pow(2, 16);
            $data['ntp.refid'] = implode('.', unpack('C*', hex2bin($data['ntp.refid'])));
            $data['ntp.reftime1'] = sprintf('%u', $data['ntp.reftime1']) - 2208988800;
            $data['ntp.reftime2'] = floor(1000000 * (sprintf('%u', $data['ntp.reftime2']) / pow(2, 32))) / 1000000;
            $data['ntp.org1'] = sprintf('%u', $data['ntp.org1']) - 2208988800;
            $data['ntp.org2'] = floor(1000000 * (sprintf('%u', $data['ntp.org2']) / pow(2, 32))) / 1000000;
            $data['ntp.rec1'] = sprintf('%u', $data['ntp.rec1']) - 2208988800;
            $data['ntp.rec2'] = floor(1000000 * (sprintf('%u', $data['ntp.rec2']) / pow(2, 32))) / 1000000;
            $data['ntp.xmt1'] = sprintf('%u', $data['ntp.xmt1']) - 2208988800;
            $data['ntp.xmt2'] = floor(1000000 * (sprintf('%u', $data['ntp.xmt2']) / pow(2, 32))) / 1000000;
          }
        }
      }
    }

    if (!empty($sock)) socket_close($sock);

    if ($data === false) {
      $err_nbr = socket_last_error();
      if (!empty($sock)) $err_nbr = socket_last_error($sock);
      $err_msg = socket_strerror($err_nbr);
      echo $err_nbr, ' - ', $err_msg, "\n";
    }

    return $data;
  }