php[tek] 2018 : Call for Speakers

getlastmod

(PHP 4, PHP 5, PHP 7)

getlastmod最終更新時刻を取得する

説明

int getlastmod ( void )

実行中のスクリプト本体の最終更新時刻を取得します。

別のファイルの最終更新時刻が知りたい場合は、 filemtime() を使用してください。

返り値

現在のページの最終更新時刻を返します。 この値は Unix のタイムスタンプで、そのまま date ()に渡す事ができます。エラーの場合は FALSE を返します。

例1 getlastmod() の例

<?php
// たとえば、'最終更新時刻:March 04 1998 20:43:59.' を出力します
echo "最終更新時刻: " date ("F d Y H:i:s."getlastmod());
?>

参考

  • date() - ローカルの日付/時刻を書式化する
  • getmyuid() - PHP スクリプト所有者のユーザー ID を取得する
  • getmygid() - PHP スクリプトの所有者の GID を得る
  • get_current_user() - 現在の PHP スクリプトの所有者の名前を取得する
  • getmyinode() - 現在のスクリプトの inode を取得する
  • getmypid() - PHP のプロセス ID を取得する
  • filemtime() - ファイルの更新時刻を取得する

add a note add a note

User Contributed Notes 7 notes

up
3
luca dot delpivo at gmail dot com
5 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.
up
1
Ant P.
7 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.
up
0
Moro
5 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;
}
?>
up
-1
rwruck
13 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'])
up
-1
Anonymous
13 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);
?>
up
-5
timeflys at users dot sourceforget dot net
14 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"];
?>
up
-5
erik dot stetina at gmail dot com
6 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)
To Top