PHP: Atomic time

<?php
$fp = fsockopen("time-a.nist.gov", 37);
if ($fp) {
fputs($fp, "\n");
$timevalue = fread($fp, 49);
fclose($fp);
}

$atomic_time = (abs(hexdec('7fffffff') - hexdec(bin2hex($timevalue)) - hexdec('7fffffff')) - 2208988800);
echo $atomic_time;
?>

This returns the time in the form of a timestamp

feof in PHP

feof — Tests for end-of-file on a file pointer
Syntax:

bool feof ( resource $handle )
Tests for end-of-file on a file pointer.

Parameters:

handle
The file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen() (and not yet closed by fclose()).

Return values: Returns TRUE if the file pointer is at EOF or an error occurs (including socket timeout); otherwise returns FALSE.



Warning
If a connection opened by fsockopen() wasn't closed by the server, feof() will hang. To workaround this, see below example:
Example #1 Handling timeouts with feof()
<?php
function safe_feof($fp, &$start = NULL) {
 $start = microtime(true);

 return feof($fp);
}

/* Assuming $fp is previously opened by fsockopen() */

$start = NULL;
$timeout = ini_get('default_socket_timeout');

while(!safe_feof($fp, $start) && (microtime(true) - $start) < $timeout)
{
 /* Handle */
}
?>
Warning
If the passed file pointer is not valid you may get an infinite loop, because feof() fails to return TRUE.
Example #2 feof() example with an invalid file pointer
<?php
// if file can not be read or doesn't exist fopen function returns FALSE
$file = @fopen("no_such_file", "r");

// FALSE from fopen will issue warning and result in infinite loop here
while (!feof($file)) {
}

fclose($file);
?>