Attempts to create the directory specified by pathname.
Note that you probably want to specify the mode as an octal number, which means it should have a leading zero. The mode is also modified by the current umask, which you can change using umask().
注: Mode is ignored on Windows, and became optional in PHP 4.2.0.
The mode is 0777 by default, which means the widest possible access. For more information on modes, read the details on the chmod() page.
成功回傳TRUE失敗回傳FALSE。
注: As of PHP 5.0.0 mkdir() can also be used with some URL wrappers. Refer to 附錄 L for a listing of which wrappers support mkdir().
注: The recursive and context parameters were added as of PHP 5.0.0.
注: 當安全模式開啟,PHP會檢查執行的腳本和要操作的檔案或目錄是否有相同的UID(擁有者)
See also rmdir().