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Query Time from a NTP Server with PHP

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Query Time from a NTP Server with PHP

A time server is a computer server that reads the precise time from a reference source and distributes this information to various clients. The most widely used protocol for distributing and synchronising time over the Internet is the Network Time Protocol (NTP), though other less-popular or outdated time protocols continue to be in use.

Your time can be synced to any number of NTP servers for the purpose of updating your own system time or querying it for another use. While most UNIX-based servers will support synchronising by default - many don't... and some other smaller servers may not provide that feature at all. This PHP function is a means of obtaining a GPS-accurate time when other methods fail you.

You can choose any number of NTP servers to sync to here .

The PHP Function

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<?php 
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/*
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 Query Time from a NTP Server with PHP
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 http://www.beliefmedia.com/query-ntp-time-server
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*/
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function beliefmedia_ntp_time($host) {
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  /* Create a socket and connect to NTP server */
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  $sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
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  socket_connect($sock, $host, 123);
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  /* Send request */
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  $msg = &quot;\010&quot; . str_repeat(&quot;\0&quot;, 47);
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  socket_send($sock, $msg, strlen($msg), 0);
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  /* Receive response and close socket */
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  socket_recv($sock, $recv, 48, MSG_WAITALL);
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  socket_close($sock);
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  /* Interpret response */
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  $data = unpack('N12', $recv);
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  $timestamp = sprintf('%u', $data[9]);
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  /* NTP is number of seconds since 0000 UT on 1 January 1900
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     Unix time is seconds since 0000 UT on 1 January 1970 */
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  $timestamp -= 2208988800;
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return $timestamp;
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}
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/* Usage */
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$host = '0.au.pool.ntp.org';
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$timestamp = beliefmedia_ntp_time($host);
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$time = date('F j, Y, g:i a', $timestamp);
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echo $time;

Download


Title: Query Time from a NTP Server
Description: Query the Server Time from a NTP Server with PHP.
  Download • Version 0.2, 914.0B, zip, Category: PHP Code & Snippets

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Martin Khoury

Martin is the Managing Director of BeliefMedia Pty Limited, and Australia's leading Finance Marketing Specialist. He is supported by a team of Australia's finest. Read more about Marty here.

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The comparison rate is calculated on a secured loan of $150,000 with a term of 25 years with monthly principal and interest payments. WARNING: This comparison rate is true only for examples given and may not include all fees and charges. Different terms, fees or other loan amounts might result in a different comparison rate. Important Information: Applications are subject to credit approval. Full terms and conditions will be included in our loan offer. Fees and charges are payable. Interest rates are subject to change. Offer does not apply to internal refinances and is not transferable between loans. As this advice has been prepared without considering your objectives, financial situation or needs, you should consider its appropriateness to your circumstances before acting on the advice. [ Example Credit Guide Link ]
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