touch
(PHP 4, PHP 5, PHP 7, PHP 8)
touch — Sets access and modification time of file
Description
$filename, ?int $mtime = null, ?int $atime = null): bool
Attempts to set the access and modification times of the file named in the
filename parameter to the value given in
mtime.
Note that the access time is always modified, regardless of the number
of parameters.
If the file does not exist, it will be created.
Parameters
-
filename -
The name of the file being touched.
-
mtime -
The touch time. If
mtimeisnull, the current system time() is used. -
atime -
If not
null, the access time of the given filename is set to the value ofatime. Otherwise, it is set to the value passed to themtimeparameter. If both arenull, the current system time is used.
Return Values
Returns true on success or false on failure.
Changelog
| Version | Description |
|---|---|
| 8.0.0 |
mtime and atime
are now nullable.
|
Examples
Example #1 touch() example
<?php
if (touch($filename)) {
echo $filename . ' modification time has been changed to present time';
} else {
echo 'Sorry, could not change modification time of ' . $filename;
}
?>
Example #2 touch() using the mtime parameter
<?php
// This is the touch time, we'll set it to one hour in the past.
$time = time() - 3600;
// Touch the file
if (!touch('some_file.txt', $time)) {
echo 'Whoops, something went wrong...';
} else {
echo 'Touched file with success';
}
?>
Notes
Note:
Note that time resolution may differ from one file system to another.
