PHP Reference
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Quick Reference

The PHP chmod() function changes permissions of the specified file.

<?php
// read and write for owner, nothing for everybody else
chmod('test.txt', 0600);

// read and write for owner, read for everybody else
chmod('test.txt', 0644);

// everything for owner, read and execute for everybody else
chmod('test.txt', 0755);

// everything for owner, read for owner's group
chmod('test.txt', 0740);
?>

Output

// changes permissions for the "test.txt" file

Syntax

chmod(file, mode)

Parameters

ParameterDescription
fileSpecifies the path to the file (required)
modeSpecifies the new permissions (required)

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 Notes:

  • When using PHP, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
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