getenv
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'])
getlastmod
(PHP 4, PHP 5)
getlastmod — Gets time of last page modification
Description
int getlastmod
( void
)
Gets the time of the last modification of the current page.
If you're interested in getting the last modification time of a different file, consider using filemtime().
Return Values
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.
Examples
Example #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());
?>
add a note
User Contributed Notesgetlastmod
rwruck
17-Oct-2004 10:28
17-Oct-2004 10:28
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
20-Mar-2003 05:28
20-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.
<?php
//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.
<?php
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)
17-Nov-2002 06:33
17-Nov-2002 06:33
for includes....
<?php
//include.php
$file = __FILE__;
$lastmod = date("M d, Y @ h:ia", filemtime($file));
?>
<?php
//footer.php
echo("page last modified: $lastmod");
?>
[EDIT by danbrown AT php DOT net: Remember that $lastmod must not be a variable that is set or unset anywhere else in the script, or it will not work as expected when printed from the footer.]
kworthington ([no@spam)] linuxmaildotorg
03-Oct-2002 06:33
03-Oct-2002 06:33
I was just informed of a workaround for the Apache 2.0 issue, do:
echo "Last modified: " . date("D F d Y h:i:s A", filemtime($_SERVER["SCRIPT_FILENAME"]));
Thanks to: Edward S. Marshall