. PHP Manual . Prev . Next . (PHP 4 CVS only) dio_write -- Writes data to fd with optional truncation at length . int dio_write ( resource fd, string data [, int len]) . The function dio_write() writes up to len bytes from data to file fd . If len is not specified, dio_write() writes all data to the specified file. dio_write() returns the number of bytes written to fd . Prev . Home . Next . dio_read . Up . dio_truncate