chmod(3) [php man page]
CHMOD(3) 1 CHMOD(3) chmod - Changes file mode SYNOPSIS
bool chmod (string $filename, int $mode) DESCRIPTION
Attempts to change the mode of the specified file to that given in $mode. PARAMETERS
o $filename - Path to the file. o $mode - Note that $mode is not automatically assumed to be an octal value, so to ensure the expected operation, you need to prefix $mode with a zero (0). Strings such as "g+w" will not work properly. <?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 ?> 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. NOTES
Note The current user is the user under which PHP runs. It is probably not the same user you use for normal shell or FTP access. The mode can be changed only by user who owns the file on most systems. Note This function will not work on remote files as the file to be examined must be accessible via the server's filesystem. Note When safe mode is enabled, PHP checks whether the files or directories you are about to operate on have the same UID (owner) as the script that is being executed. In addition, you cannot set the SUID, SGID and sticky bits. SEE ALSO
chown(3), chgrp(3), fileperms(3), stat(3). PHP Documentation Group CHMOD(3)
Check Out this Related Man Page
CHMOD(1) General Commands Manual CHMOD(1) NAME
chmod - change mode SYNOPSIS
chmod [ -Rf ] mode file ... DESCRIPTION
The mode of each named file is changed according to mode, which may be absolute or symbolic. An absolute mode is an octal number con- structed from the OR of the following modes: 4000 set user ID on execution 2000 set group ID on execution 1000 sticky bit, see chmod(2) 0400 read by owner 0200 write by owner 0100 execute (search in directory) by owner 0070 read, write, execute (search) by group 0007 read, write, execute (search) by others A symbolic mode has the form: [who] op permission [op permission] ... The who part is a combination of the letters u (for user's permissions), g (group) and o (other). The letter a stands for all, or ugo. If who is omitted, the default is a but the setting of the file creation mask (see umask(2)) is taken into account. Op can be + to add permission to the file's mode, - to take away permission and = to assign permission absolutely (all other bits will be reset). Permission is any combination of the letters r (read), w (write), x (execute), X (set execute only if file is a directory or some other execute bit is set), s (set owner or group id) and t (save text - sticky). Letters u, g, or o indicate that permission is to be taken from the current mode. Omitting permission is only useful with = to take away all permissions. When the -R option is given, chmod recursively descends its directory arguments setting the mode for each file as described above. When symbolic links are encountered, their mode is not changed and they are not traversed. If the -f option is given, chmod will not complain if it fails to change the mode on a file. EXAMPLES
The first example denies write permission to others, the second makes a file executable by all if it is executable by anyone: chmod o-w file chmod +X file Multiple symbolic modes separated by commas may be given. Operations are performed in the order specified. The letter s is only useful with u or g. Only the owner of a file (or the super-user) may change its mode. SEE ALSO
ls(1), chmod(2), stat(2), umask(2), chown(8) 7th Edition May 22, 1986 CHMOD(1)