(PHP 4, PHP 5, PHP 7)
chmod — Changes file mode
Attempts to change the mode of the specified file to that given in
Path to the file.
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.
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
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'.
// Read and write for owner, nothing for everybody else
// Read and write for owner, read for everybody else
// Everything for owner, read and execute for others
// Everything for owner, read and execute for owner's group
TRUE on success or
FALSE on failure.
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.
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.