(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5)
dio_write — Writes data to fd with optional truncation at length
dio_write() writes up to len bytes from data to file fd .
The file descriptor returned by dio_open().
The written data.
The length of data to write in bytes. If not specified, the function writes all the data to the specified file.
Returns the number of bytes written to fd .