超越PHP - Exceed PHP: gmmktime

说明

int gmmktime ( [int hour [, int minute [, int second [, int month [, int day [, int year [, int is_dst]]]]]]])

和 mktime() 完全一样，只除了返回值是格林威治标准时的时间戳。

和 mktime() 一样，参数可以从右到左依次空着，空着的参数会被设为相应的当前 GMT 值。

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gmmktime

zhong311 at collegeclub dot com
14-Feb-2004 07:40

When attempting to use HTTP's If-Modified-Since features for caching I ran
into the problem of being able to compare the GMT date the browser was
sending to my own Last-Modified date (stored in a database field). I saw
many examples of how to create a GMT date from a unix timestamp, but little
on how to actually get a GMT date into a unix timestamp. Perhaps someone
has a better way, here's my solution:

<?php

function
gmstrtotime($sgm) {
    $months = array(
      'Jan'=>1,
     
'Feb'=>2,
      'Mar'=>3,
      'Apr'=>4,
     
'May'=>5,
      'Jun'=>6,
      'Jul'=>7,
     
'Aug'=>8,
      'Sep'=>9,
      'Oct'=>10,
     
'Nov'=>11,
      'Dec'=>12
    );
    list($D, $d, $M, $Y,
$H, $i, $s) = sscanf($sgm, "%3s, %2d %3s %4d %2d:%2d:%2d
GMT");
    return gmmktime($H, $i, $s, $months[$M], $d,
$Y);
}

// test: after all is said and done
// $time should be
the same as $gmtime

$time = time();
$us = date("m/d/Y
H:i:s",$time);
$sgm = gmdate("D, d M Y H:i:s",$time) .
" GMT";

$gmtime = gmstrtotime($sgm);

echo $us .
"
";
echo $sgm . "
";
echo $time .
"
";
echo $gmtime .
"
";

?>

My results:

02/13/2004
10:45:42
Fri, 13 Feb 2004 20:45:42
GMT
1076705142
1076705142

Credit to kyle at frozenonline dot
com for his strtotime example

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