PHP - Manual: getlastmod

2024-12-22

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getlastmod

(PHP 4, PHP 5, PHP 7, PHP 8)

getlastmod — 获取页面最后修改的时间

说明

getlastmod(): int

获取执行的主脚本的最后修改时间。

如果你对其他文件的最后修改时间的感兴趣，可考虑使用 filemtime()。

返回值

返回当前页面最后修改的时间。这个值是一个 Unix 时间戳，可以传入 date()。错误时返回 false。

范例

示例 #1 getlastmod() 例子


<?php
// 输出类似 'Last modified: March 04 1998 20:43:59.'
echo "Last modified: " . date ("F d Y H:i:s.", getlastmod());
?>

参见

date() - 格式化一个本地时间／日期
getmyuid() - 获取 PHP 脚本所有者的 UID
getmygid() - 获取当前 PHP 脚本拥有者的 GID
get_current_user() - 获取当前 PHP 脚本所有者名称
getmyinode() - 获取当前脚本的索引节点（inode）
getmypid() - 获取 PHP 进程的 ID
filemtime() - 取得文件修改时间

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User Contributed Notes 7 notes

down

luca dot delpivo at gmail dot com ¶

10 years ago


With better words getlastmod() returning the last time the script in which it is being called was modified, it does not require or use a parameter.

down

Moro ¶

9 years ago


Return latest mod time of all included files:


<?php

function get_page_mod_time() {

    $incls = get_included_files();

    $incls = array_filter($incls, "is_file");

    $mod_times = array_map('filemtime', $incls);

    $mod_time = max($mod_times);


    return $mod_time;

}

?>

down

-1

Ant P. ¶

12 years ago


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.

down

-2

rwruck ¶

17 years ago


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'])

down

-3

Anonymous ¶

18 years ago


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);
?>

down

-8

timeflys at users dot sourceforget dot net ¶

19 years ago


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"];

?>

down

-8

erik dot stetina at gmail dot com ¶

10 years ago


function for displaying last modification time accross more direcotries. e.g. to display last modification date in "about" section of your web page

<?php
function array_prefix_values($prefix, $array)
{
  $callback = create_function('$s','return "'.$prefix.'".$s;');
  return array_map($callback,$array);
}

function get_last_update()
{
  if ( func_num_args() < 1 ) return 0;
  $dirs = func_get_args();
  $files = array();
  foreach ( $dirs as $dir )
  {
    $subfiles = scandir($dir);
    $subfiles = array_prefix_values($dir,$subfiles);
    $subfiles = array_filter($subfiles,"is_file");
    $files = array_merge($files,$subfiles);
  }
  $maxtimestamp = 0;
  $maxfilename = "";
  foreach ( $files as $file )
  {
    $timestamp = filemtime($file);
    if ( $timestamp > $maxtimestamp )
    {
      $maxtimestamp = $timestamp;
      $maxfilename = $file; 
    }
  }
  return date("Ymd",$maxtimestamp)." ($maxfilename)";
}

print "last update: ".get_last_update("./lib/", "./css/", "./lang/");
?>

OUTPUT:
last update: 20110927 (./lang/sk.php)

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官方地址：https://www.php.net/manual/en/function.getlastmod.php

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PHP官方手册 - 互联网笔记

getlastmod

说明

返回值

范例

参见

User Contributed Notes 7 notes