PHP mkdir 777 failed

Reference URL: https://www.cnblogs.com/52php/p/5660079.html

In a Linux system, there is a default permission to create a file/folder, which is affected by the umask setting, and we can find the following configuration in the/ETC/BASHRC configuration file:

This explains the problem, the default umask of Linux system is 022, and after our 777 & operation, it becomes 755, which is why.

Workaround:

mkdir (' Test ', 0777); chmod (' Test ', 0777);

　　

PHP mkdir 777 failed