(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5)
dio_close — Closes the file descriptor given by fd
The function dio_close() closes the file descriptor fd .
No value is returned.
Example #1 Closing an open file descriptor
<?php
$fd = dio_open('/dev/ttyS0', O_RDWR);
dio_close($fd);
?>