Why can't PHP create a directory with 777 permissions?
PhpMkdirPhp Problem Overview
I'm trying to create a directory on my server using PHP with the command:
mkdir("test", 0777);
But it doesn't give full permissions, only these:
rwxr-xr-x
Php Solutions
Solution 1 - Php
The mode is modified by your current umask, which is 022 in this case.
The way the umask works is a subtractive one. You take the initial permission given to mkdir and subtract the umask to get the actual permission:
0777
- 0022
======
0755 = rwxr-xr-x.
If you don't want this to happen, you need to set your umask temporarily to zero so it has no effect. You can do this with the following snippet:
$oldmask = umask(0);
mkdir("test", 0777);
umask($oldmask);
The first line changes the umask to zero while storing the previous one into $oldmask. The second line makes the directory using the desired permissions and (now irrelevant) umask. The third line restores the umask to what it was originally.
Solution 2 - Php
The creation of files and directories is affected by the setting of umask. You can create files with a particular set of permissions by manipulating umask as follows :-
$old = umask(0);
mkdir("test", 0777);
umask($old);
Solution 3 - Php
Avoid using this function in multithreaded webservers. It is better to change the file permissions with chmod() after creating the file.
Example:
$dir = "test";
$permit = 0777;
mkdir($dir);
chmod($dir, $permit);
Solution 4 - Php
For those who tried
mkdir('path', 777);
and it did not work.
It is because, apparently, the 0 preceding the file mode is very important which tells chmod to interpret the passed number as an Octal instead of a decimal.
Ps. This is not a solution to the question but only an add-on to the accepted anwser
Solution 5 - Php
Probably, your umask is set to exclude those
Solution 6 - Php
In my case, I have to use the following way for centos7, which solved the problem
$oldmask = umask(000);//it will set the new umask and returns the old one
mkdir("test", 0777);
umask($oldmask);//reset the old umask
More details can be found at https://www.php.net/manual/en/function.umask.php