chmod() function in PHP

The chmod() function changes the file mode. It returns TRUE on success and FALSE on failure.

Syntax

chmod($file_path, file_mode)

Parameters

• file_path − Set the path of file or directory to be checked for existence. Required.

• file_mode − Set the mode with values. The description of file_mode parameter is shown below

File Mode parameter

Set the file mode with the following four values.

• zero
• permission for owner
• permission for the owner’s user group
• permissions for rest

The following are the values to set multiple permissions. You need to add the following numbers −

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

Return

The file_exists() method returns.

• True, on success
• False, on failure

Example

The following is an example that changes the mode for file “one.txt”. This sets read and write permission for owner, nothing for everybody else.

<?php
   // Setting mode for file
   // Read and write permission for owner, nothing for everybody else
   chmod("one.txt",0600);
?>

Let us see another example that changes the file mode for “two.txt”. This sets read and write permission for owner, read for everybody else.

<?php
   // Setting mode for file
   // Read and write permission for owner, read for everybody else
   chmod("two.txt",0644);
?>

Let us see another example that changes the file mode for “three.txt”. This sets all the permissions for owner, read and execute for everybody else.

<?php
   // Setting mode for file
   // All the permissions for owner, read and execute for everybody else
   chmod("three.txt",0755);
?>

Let us see another example that changes the file mode for “four.txt”. This sets all the permissions for owner, read for owner's group.

<?php
   // Setting mode for file
   // All the permissions for owner, read for owner's group
   chmod("four.txt",0740);
?>

Let us see another example that changes the file mode for “five.txt”. This sets all the permissions for owner, read and execute for owner's group.

<?php
   // Setting mode for file
   // All the permissions for owner, read and execute for owner's group
   chmod("five.txt",0740);
?>