PHP chmod Function: Changing File Permissions

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

Signature: chmod(string $filename, int $mode): bool Description: Attempts to set the file mode of $filename to the value given by $mode. The mode must be provided as an octal integer (e.g., 0755); strings such as "g+w" are not accepted.

Parameters:

filename – the path to the file.

mode – the permission bits; must be an octal integer, prefixed with 0.

Return value: Returns TRUE on success, FALSE on failure.

Examples:

Example 1 (incorrect decimal mode, correct octal mode):

<?php
chmod("/somedir/somefile", 755); // decimal, may be wrong
chmod("/somedir/somefile", "u+rwx,go+rx"); // string, wrong
chmod("/somedir/somefile", 0755); // correct octal
?>

Example 2 (various permission settings):

<?php
// Read and write for owner, nothing for everybody else
chmod("/somedir/somefile", 0600);
// Read and write for owner, read for everybody else
chmod("/somedir/somefile", 0644);
// Everything for owner, read and execute for others
chmod("/somedir/somefile", 0755);
// Everything for owner, read and execute for owner's group
chmod("/somedir/somefile", 0750);
?>