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mkdir (
string $directory ,
int $permissions = 0777 ,
bool $recursive = false ,
? resource $context = null
): bool 尝试新建由 directory 指定的目录。 jack dot sleight at gmail dot com
14 years ago
When using the recursive parameter bear in mind that if you're using chmod() after mkdir() to set the mode without it being modified by the value of uchar() you need to call chmod() on all created directories. ie:

<?php
mkdir
( '/test1/test2' , 0777 , true );
chmod ( '/test1/test2' , 0777 );
?>

May result in "/test1/test2" having a mode of 0777 but "/test1" still having a mode of 0755 from the mkdir() call. You'd need to do:

<?php
mkdir
( '/test1/test2' , 0777 , true );
chmod ( '/test1' , 0777 );
chmod ( '/test1/test2' , 0777 );
?>
aulbach at unter dot franken dot de
25 years ago
This is an annotation from Stig Bakken:

The mode on your directory is affected by your current umask. It will end
up having (<mkdir-mode> and (not <umask>)). If you want to create one
that is publicly readable, do something like this:

<?php
$oldumask
= umask ( 0 );
mkdir ( 'mydir' , 0777 ); // or even 01777 so you get the sticky bit set
umask ( $oldumask );
?>
Protik Mukherjee
19 years ago
mkdir, file rw, permission related notes for Fedora 3////
If you are using Fedora 3 and are facing permission problems, better check if SElinux is enabled on ur system. It add an additional layer of security and as a result PHP cant write to the folder eventhough it has 777 permissions. It took me almost a week to deal with this!

If you are not sure google for SElinux or 'disabling SELinux' and it may be the cure! Best of luck!
chelidze dot givia at gmail dot com
1 year ago
When creating a file using mkdir() the default root will be the DocumentRoot (in XAMPP) itself.

C:\xampp\htdocs\project/includes/something.php

If you use mkdir("myfile") in something.php, instead of creating the folder in includes, php will create it in the project folder