php的mkdir()函数创建文件夹比较安全的权限设置方

mkdir('./aa/',0777);

xw@xw-X201:~/Desk/dd/aa$ umask
0022
xw@xw-X201:~/Desk/dd/aa$ php -r "mkdir('./xw/',0777);"
xw@xw-X201:~/Desk/dd/aa$ php -r "mkdir('./xw1/',0755);"
xw@xw-X201:~/Desk/dd/aa$ php -r "mkdir('./xw2/',0747);"
xw@xw-X201:~/Desk/dd/aa$ ll
总用量 20
drwxrwxrwx 5 xw xw 4096 2012-06-01 11:58 ./
drwxr-xr-x 6 xw xw 4096 2012-06-01 11:26 ../
drwxr-xr-x 2 xw xw 4096 2012-06-01 11:57 xw/
drwxr-xr-x 2 xw xw 4096 2012-06-01 11:58 xw1/
drwxr--r-x 2 xw xw 4096 2012-06-01 11:58 xw2/

xw@xw-X201:~/Desk/dd/aa$ umask 000
xw@xw-X201:~/Desk/dd/aa$ php -r "mkdir('./xw2/',0777);"
xw@xw-X201:~/Desk/dd/aa$ ll
总用量 12
drwxrwxrwx 3 xw xw 4096 2012-06-01 12:08 ./
drwxr-xr-x 6 xw xw 4096 2012-06-01 11:26 ../
drwxrwxrwx 2 xw xw 4096 2012-06-01 12:08 xw2/

xw@xw-X201:~/Desk/dd/aa$ umask
0022
xw@xw-X201:~/Desk/dd/aa$ php -r "mkdir('./xw1/',0777);"
xw@xw-X201:~/Desk/dd/aa$ php -r "mkdir('./xw2/');"
xw@xw-X201:~/Desk/dd/aa$ php -r "mkdir('./xw3/');chmod('./xw3/',0777);"
xw@xw-X201:~/Desk/dd/aa$ ll
总用量 20
drwxrwxrwx 5 xw xw 4096 2012-06-01 12:12 ./
drwxr-xr-x 6 xw xw 4096 2012-06-01 11:26 ../
drwxr-xr-x 2 xw xw 4096 2012-06-01 12:11 xw1/
drwxr-xr-x 2 xw xw 4096 2012-06-01 12:11 xw2/
drwxrwxrwx 2 xw xw 4096 2012-06-01 12:12 xw3/

xw@xw-X201:~/Desk/dd/aa$ umask
0022
xw@xw-X201:~/Desk/dd/aa$ mkdir -m0777 xw
xw@xw-X201:~/Desk/dd/aa$ ll
总用量 12
drwxrwxrwx 3 xw xw 4096 2012-06-01 12:18 ./
drwxr-xr-x 6 xw xw 4096 2012-06-01 11:26 ../
drwxrwxrwx 2 xw xw 4096 2012-06-01 12:18 xw/

mkdir('./xw/');
chmod('./xw/',0777);