PHP Create folder and cannot create folder cause workaround _php Tutorial

First, how can not create permissions to set the directory a disk 0777 can be, with the program to change the directory permissions with chmod two, with FTP three, with the server permissions to do better,

PHP Tutorial Creating folders and unable to create folders cause workaround
Create a directory in PHP we'll use the mkdir () function to create the directory
*/

$dir = "abc";
if (mkdir ($dir, 0777))
{
echo ' directory '. $dir. ' Successfully created ';
}
Else
{
Echo ' failed to create directory, please check permissions ';
}

/*

mkdir Function Description
mkdir (Path,mode,recursive,context)
Path is required. The name of the directory that was created.
Mode required. The default is 0777.
Recursive required. Sets the recursive mode.
Context required. Specifies the environment for file handles.

mkdir related examples
Http://www.bkjia.com/phper/24/mkdir-05.htm

Unable to create folder reason analysis

First, how can not create permissions to set the directory a disk 0777 can be, with the program to change the directory permissions with chmod
Second, with the FTP
Third, the use of server permissions is better done,

Umask is 0777 when, of course, the use of their own hands chmod change not on the line

chmod function Description
chmod (File,mode)

Such as:

chmod ("/somedir/somefile", 0755);

chmod related examples
Http://www.bkjia.com/phper/24/chmod-php.htm
Http://www.bkjia.com/phper/24/ad7d09f46fce96a82f06fe711adeb47b.htm

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