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PHP umask() Function


PHP Filesystem Reference Complete PHP Filesystem Reference

Definition and Usage

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

This function sets PHP's umask to mask & 0777 and returns the old umask. However, if you call umask() without any arguments, it returns the current umask.

Syntax

umask(mask)

Parameter Description
mask Optional. Specifies the new permissions. Default is 0777

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


PHP Filesystem Reference Complete PHP Filesystem Reference

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