php - chmod

Changes file mode
bool chmod ( string $filename, int $mode )

Attempts to change the mode of the specified file to that given in mode.

Path to the file.
Note that mode is not automatically assumed to be an octal value, so strings (such as "g+w") will not work properly. To ensure the expected operation, you need to prefix mode with a zero (0):
<?php  chmod("/somedir/somefile", 755); // decimal; probably incorrect chmod("/somedir/somefile", "u+rwx,go+rx"); // string; incorrect chmod("/somedir/somefile", 0755); // octal; correct value of mode ?>
The mode parameter consists of three octal number components specifying access restrictions for the owner, the user group in which the owner is in, and to everybody else in this order. One component can be computed by adding up the needed permissions for that target user base. Number 1 means that you grant execute rights, number 2 means that you make the file writeable, number 4 means that you make the file readable. Add up these numbers to specify needed rights. You can also read more about modes on Unix systems with 'man 1 chmod' and 'man 2 chmod'.
<?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); ?>

Return Values

Returns TRUE on success or FALSE on failure.