tmpfile
This example resolve some drawbacks with DayLight Saving Flag and TimeZone in Windows with native function 'touch()'
See function comments for details
Usage:
------
<?php
// mtime of source File
$time = filemtime("/source.txt");
// Sync mtime at destination file with source file
betouch("/destination.txt",$time);
/**
* Function: Best Effort Touch
* Update recursively mtime at especified file and verify.
*
* This function, resolve 2 drawbacks with native function 'touch()' on Windows:
* - touch() Return incorrect result (PHP v5.2.5)
* - touch() Is affected by DayLight Saving Flag and TimeZone
*
* @access public
* @param String $file Full path to target file
* @param int $time Unix Timestamp
* @param int $offset Offset (Default: 0)
* @return boolean
*/
function betouch($file, $time, $offset = 0){
// Add offset to requested mtime
$new_mtime = $time + $offset;
// Calling native touch
$result = touch($file, $new_mtime, $new_mtime);
// If 'touch()' return OK
if($result){
// Clears file status cache
clearstatcache();
// Get recently stored mtime at destination file
$stored_mtime = filemtime($file);
// Verify if stored is equal to requested mtime
if($stored_mtime == $time){
return true;
}else{
// Calculate offset between stored mtime and requested mtime
$offset = $time - $stored_mtime;
// Recall recursively with new offset and return
return betouch($file, $time, $offset);
}
}
// Native touch() fail
return false;
}
?>
Lucas Fonzalida
Buenos Aires - Argentina
contacto at lucasfonzalida.com.ar
touch
(PHP 4, PHP 5)
touch — ファイルの最終アクセス時刻および最終更新日をセットする
説明
bool touch
( string $filename
[, int $time
[, int $atime
]] )
filename で指定されたファイルの最終更新日を、 time で指定された値に セットしようと試みます。 パラメータの数にかかわらず、アクセス時刻は 常に変更されることに注意しましょう。
ファイルが存在しない場合、ファイルが生成されます。
パラメータ
- filename
-
処理したいファイルの名前。
- time
-
設定する時刻。 time を省略した場合は、 現在時刻を使用します。
- atime
-
指定されたファイルの最終アクセス時刻が atime にセットされます。
返り値
成功した場合に TRUE を、失敗した場合に FALSE を返します。
変更履歴
| バージョン | 説明 |
|---|---|
| 5.3.0 | Windows 環境でディレクトリの最終更新日が変更できるようになりました。 |
例
例1 touch() の例
<?php
if (touch($FileName)) {
echo "$FileName modification time has been changed to present time";
} else {
echo "Sorry, could not change modification time of $FileName";
}
?>
例2 touch() で time パラメータを使用する例
<?php
/*
* 作成時刻を、ここでは
* 1 時間前に設定します
*/
$time = time() - 3600;
/* ファイルを作成します */
if(!touch('some_file.txt', $time))
{
echo 'おっと、何かがおかしいようです...';
}
else
{
echo 'ファイルの作成に成功しました';
}
?>
注意
注意: 時刻の精度は、 ファイルシステムによって異なることがあります。
警告
PHP 5.3.0 より前のバージョンでは、Windows 環境のもとでは この関数によってディレクトリの最終更新日を変更することはできませんでした。
add a note
User Contributed Notestouch
contacto at lucasfonzalida.com.ar
06-Jan-2009 09:44
06-Jan-2009 09:44
info at archiwumrocka dot art dot pl
01-Dec-2008 11:59
01-Dec-2008 11:59
Only way to change modification date in catalogue is to create file in via touch() and dalete it with unlink():
<?php
$dir = 'temp';
$files1 = scandir($dir);
$files1 = array_slice($files1, 2);
foreach ($files1 as $key => $val)
{
if (!is_dir($val)) continue;
if (!touch($val))
{
touch($val . "/plik.txt");
unlink($val . "/plik.txt");
}
}
?>
mrgrier at yahoo dot com
29-Nov-2008 08:29
29-Nov-2008 08:29
At least on Linux, touch will not change the time on a symlink itself, but on the file/directory it points to. The only way to work around this is to unlink the symlink, then recreate it.
It took a bit of searching to discover this. The OS itself provides no way to do it. Many people wondered why anyone would want to do this. I use symlinks inside a web tree to point to files outside the web tree. After a certain length of time has passed, I want the symlinks to die, so the files cannot be successfully hotlinked.
ddalex at gmail dot com
03-Nov-2008 07:25
03-Nov-2008 07:25
Actually, Glen is right, PHP won't touch if it is not the current owner of the file, even if the directory and files are writeable by the PHP user.
Bess E. R. Wisser
25-Aug-2008 11:20
25-Aug-2008 11:20
"Glen: In unix on the command-line, you can touch files you don't own - but like other comments on this page state - PHP's built in touch won't work."
No, you can not modify files you don't have write access to in a multi-user environment, ever, under any circumstances. The reason why you fail to do this "in PHP" is because your httpd is most likely running as a "shared" setup, running as nobody/nobody, and your user's files aren't world-writable, and they are not owned by nobody/nobody. Change your required files to be world-writable and you can touch() them, and more.
Radon8472
08-Aug-2008 03:07
08-Aug-2008 03:07
Important info:
touch() used on a directory always returns FALSE and prints "Permission denied" on NTFS and FAT Filesystem (tested on winXP).
Jeff
26-Jun-2008 10:29
26-Jun-2008 10:29
I've been trying to set a filemtime into the future with touch() on PHP5.
It seems touch $time has a future limit around 1000000 seconds (11 days or so). Beyond this point it reverts to a previous $time.
It doesn't make much sense but I could save you hours of time.
$time = time()+1500000;
touch($cachedfile,$time);
Glen
18-Oct-2007 11:01
18-Oct-2007 11:01
In unix on the command-line, you can touch files you don't own - but like other comments on this page state - PHP's built in touch won't work.
I simple alternative (on unix):
<?php
function touch_it_good($filename)
{
exec("touch {$filename}");
}
?>
ilrazziatore85 AT yahoo DOT it
21-May-2007 06:10
21-May-2007 06:10
Feathern wrote a little script for fetching files from a directory after a certain date.
However the if statement (line 8) should be:
if(($test[2] > 2002) || (($test[2] = 2002) && ($test[0] > 6)) || (($test[2] = 2002) && ($test[0] = 6) && ($test[1] > 17))){
echo $filelist[$i]."\r\n";
}
Otherwise the script won't fetch lots of files it should.
(In the example given, it should fetch all the files created after 06/17/2002, but the original script would miss files created 03/18/2003 or 11/01/2004)
seocab at rit dot edu
31-Mar-2007 07:09
31-Mar-2007 07:09
The script for modifying the access time without modifying the modified time is overly complicated:
<? touch($filename, date('U', filemtime($filename)), time()); ?>
Since filemtime returns a UNIX timestamp, there is no need to call date('U') so the script could be simplified to:
<? touch($filename,filemtime($filename),time()); ?>
Charles Belov
19-Jul-2006 04:10
19-Jul-2006 04:10
Update the access time without updating the modified time:
Unix command: touch -a filename
PHP: touch(filename, date('U', filemtime(filename)), time())
spam at webmastersguide dot com
01-Sep-2005 03:09
01-Sep-2005 03:09
If you're going to go around deleting (unlinking) files
that you don't own just in order to change the modification
time on the file, you darn well better chown() the file
back to it's original ownership after you are done and
chmod() it back to it's correct permissions. Otherwise
you will almost certainly break things. Additionally the
code listed for touch()ing a file you don't own should
set the file creation time back to it's original time if
what is wanted is to just change the modification time.
Also, the code listed will break things if there is an i/o
error such as disk full or too many files in the directory.
Here's how the code SHOULD be written:
Create the new file FIRST, rather than last, with a different
name such as $file.tmp.
Read the ownership, permissions, and creation time of the old file.
Set permissions and creation time of the new file the same as the old.
Rename the new file to the name of the old.
chown() the new file to the user that owned the file it's replacing.
Please be careful adding to the documentation if you've
never taken programming 101.
rf_public at yahoo dot co dot uk
25-Jul-2005 10:19
25-Jul-2005 10:19
Note: the script to touch a file you don't own will change it's owner so ensure permissions are correct or you could lose access to it
guy at forster design dot com
12-May-2005 01:42
12-May-2005 01:42
Here's a little workaround that allows the PHP user to touch a file it doesn't own:
<?php
$target_file = "/path/to/file/filename.txt"; //system filepath to your file
$file_content = implode("",file($target_file));
@unlink($target_file);
if($savetofile = fopen($target_file, "w")) {
fputs($savetofile, $file_content);
fclose($savetofile);
}
$new_date = strtotime("23 April 2005"); // set the required date timestamp here
touch($target_file,$new_date);
?>
Of course, PHP needs to have write access to the folder containing the file you want to touch, but that should be easy to arrange.
feathern at yahoo dot com
14-Aug-2002 01:31
14-Aug-2002 01:31
Neat little script that will give you a list of all modified files in a certain folder after a certain date:
$filelist = Array();
$filelist = list_dir("d:\\my_folder");
for($i=0;$i<count($filelist);$i++){
$test = Array();
$test = explode("/",date("m/d/Y",filemtime($filelist[$i])));
//example of files that are later then
//06/17/2002
if(($test[2] > 2001) && ($test[1] > 16) && ($test[0] > 5)){
echo $filelist[$i]."\r\n";
}
clearstatcache();
}
function list_dir($dn){
if($dn[strlen($dn)-1] != '\\') $dn.='\\';
static $ra = array();
$handle = opendir($dn);
while($fn = readdir($handle)){
if($fn == '.' || $fn == '..') continue;
if(is_dir($dn.$fn)) list_dir($dn.$fn.'\\');
else $ra[] = $dn.$fn;
}
closedir($handle);
return $ra;
}
emilebosch at hotmail dot com
07-Oct-2001 01:41
07-Oct-2001 01:41
To spare you ppl couple of hours of valuable time, you can only TOUCH a file that you own! Usually PHP is *nobody*
Warm regards,
Emile Bosch
master at dreamphp dot com
15-May-2001 09:23
15-May-2001 09:23
$filename = "test.dat";
if (!file_exists($filename)) {
touch($filename); // Create blank file
chmod($filename,0666);
}