(PHP 4, PHP 5, PHP 7, PHP 8)
umask — Changes the current umask
$mask = null): int
umask() sets PHP's umask to
mask & 0777 and returns the old
umask. When PHP is being used as a server module, the umask
is restored when each request is finished.
maskThe new umask.
If mask is null, umask()
simply returns the current umask otherwise the old umask is returned.
| Version | Description |
|---|---|
| 8.0.0 |
mask is nullable now.
|
Example #1 umask() example
<?php
$old = umask(0);
chmod("/path/some_dir/some_file.txt", 0755);
umask($old);
// Checking
if ($old != umask()) {
die('An error occurred while changing back the umask');
}
?>
Note:
Avoid using this function in multithreaded webservers. It is better to change the file permissions with chmod() after creating the file. Using umask() can lead to unexpected behavior of concurrently running scripts and the webserver itself because they all use the same umask.