getlastmod

Description

int getlastmod ( void )

Returns the time of the last modification of the current page. The value returned is a Unix timestamp, suitable for feeding to date(). Returns FALSE on error.

例子 1. getlastmod() example
<?php // outputs e.g. 'Last modified: March 04 1998 20:43:59.' echo "Last modified: " . date ("F d Y H:i:s.", getlastmod()); ?>

注: If you're interested in getting the last modification time of a different file, consider using filemtime().

add a note User Contributed Notes

rwruck
17-Oct-2004 09:28


DO NOT use this function unless you are absolutely sure both your Apache and PHP have been compiled with the same value for -DFILE_OFFSET_BITS.



If not, this function will return the access time (or maybe even garbage) instead of the modification time due do Apache and PHP using different versions of the stat structure.



This is true regardless of Apache and PHP version.



To be on the safe side, always use the workaround already posted below:

filemtime($_SERVER['SCRIPT_FILENAME'])

19-May-2004 07:36


Setting the 'Last-Modified' header:

<?php

setlocale(LC_TIME, "C");

$ft = filemtime ('referencefile');

$localt = mktime ();

$gmtt = gmmktime ();

$ft = $ft - $gmtt + $localt;

$modified = strftime ("%a, %d %b %Y %T GMT", $ft);

?>

timeflys at users dot sourceforget dot net
21-Mar-2003 05:28


I found issues using getlastmod() to test whether or not I was successful in setting the Last Modified date in the header. The code below shows the same Last Modified date before and after I set the Last-Modified header.



=====getlastmod



<?

//True modified date

$modified = date ("F d Y H:i:s.", getlastmod());

    

//artificial modified date - sent to header

$last_modified = gmdate('D, d M Y H:i:s T', (time() - 43200));

     

//caching prevention

header("Last-Modified: $last_modified GMT");

header("Cache-Control: no-store, no-cache, must-revalidate");  // HTTP/1.1

header("Cache-Control: post-check=0, pre-check=0", false);

    header("Pragma: no-cache");                          // HTTP/1.0



$getlast_modified = date ("F d Y H:i:s.", getlastmod());



print "True modified date(Before): $modified <p /> Date sent to header(After): $getlast_modified";

?>



I then used the PEAR, HTTP_Request class which worked, the Last-Modified date updates everytime it is requested, the desired effect.



======HTTP_Request

<?

require 'HTTP/Request.php';

$r = new HTTP_Request('http://www.sample.com/page.php');

$r->sendRequest();

$response_headers = $r->getResponseHeader();

print $response_headers["last-modified"];

?>

Richard Anderson(r85anderson at yahoo dot com)
18-Nov-2002 05:33


for includes....



<?

//include.php

$file = __FILE__;

$lastmod = date("M d, Y @ h:ia", filemtime($file));

?>



<?

//footer.php

echo("page last modified: $lastmod");

?>

kworthington ([no@spam)] linuxmaildotorg
04-Oct-2002 06:33


I was just informed of a workaround for the Apache 2.0 issue, do:

echo "Last modified: " . date("D F d Y h:i:s A", filemtime($_SERVER["SCRIPT_FILENAME"]));

Thanks to: Edward S. Marshall

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