PHP umask() Function

Definition

The umask() function changes the file permissions for files.

This function sets PHP's umask to mask & 0777 and returns the old umask.

Calling umask() without any arguments returns the current umask.

Syntax

PHP umask() Function has the following syntax.

Parameter

The mode parameter consists of four numbers:

• The first number is always zero
• The second number specifies permissions for the owner
• The third number specifies permissions for the owner's user group
• The fourth number specifies permissions for everybody else

Possible values (to set multiple permissions, add up the following numbers):

• 1 = execute permissions
• 2 = write permissions
• 4 = read permissions

Return

umask() without arguments simply returns the current umask otherwise the old umask is returned.

Example

<?php//from   w  ww  . j a v a  2 s .  c om
$old = umask(0);
chmod("test.txt", 0755);
umask($old);

// Checking
if ($old != umask()) {
    die('An error occurred while changing back the umask');
}
?>