(PHP 4 >= 4.3.2, PHP 5, PHP 7, PHP 8)
streamWrapper::dir_closedir — Close directory handle
This method is called in response to closedir().
Any resources which were locked, or allocated, during opening and use of the directory stream should be released.
此函数没有参数。
成功时返回 true， 或者在失败时返回 false。