getenv
If you use register_shutdown_function() on certain SAPIs, various filesystem-related things inside the shutdown function might do unexpected things, one of which being this function can return false.
On the other hand getlastmod() apparently caches the return value, so if you use it at least once in normal code it should work for the remainder of the request.
getlastmod
(PHP 4, PHP 5)
getlastmod — Obtém o tempo da última modificação na pagina
Descrição
int getlastmod
( void
)
Obtém a hora da última modificação da página atual.
Se você está interessado em obter a hora da última modificação de um arquivo diferente, considere usar filemtime().
Valor Retornado
Retorna o tempo da última modificação na pagina atual. O valor é retornado como um Unix timestamp, útil para usar com a função date(). Retorna FALSE em caso de erro.
Exemplos
Exemplo #1 Exemplo da getlastmod()
<?php
// mostra por exemplo 'Última Modificação: March 04 1998 20:43:59.'
echo "Última Modificação: " . date ("F d Y H:i:s.", getlastmod());
?>
Veja Também
- date() - Formata a data e a hora local
- getmyuid() - Obtém o UID do dono do script PHP
- getmygid() - Obtém o GID do dono do script PHP
- get_current_user() - Obtém o nome do dono do script PHP atual
- getmyinode() - Obtém o inode do script atual
- getmypid() - Obtém o ID do processo PHP
- filemtime() - Obtém o tempo de modificação do arquivo
User Contributed Notes
getlastmod
getlastmod
Ant P.
24-Feb-2010 03:48
24-Feb-2010 03:48
rwruck
17-Oct-2004 10:28
17-Oct-2004 10:28
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 08:36
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 06:28
20-Mar-2003 06:28
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 07:33
17-Nov-2002 07:33
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 $lastmod must not be a variable that is set or unset anywhere else in the script, or it will not work as expected when printed from the footer.]
kworthington ([no@spam)] linuxmaildotorg
03-Oct-2002 07:33
03-Oct-2002 07:33
I was just informed of a workaround for the Apache 2.0 issue, do:
echo "Last modified: " . date("D F d Y h:i:s A", filemtime($_SERVER["SCRIPT_FILENAME"]));
Thanks to: Edward S. Marshall