(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)
dio_close — Closes the file descriptor given by fd
dio_close ( resource $fd ) : void
The function dio_close() closes the file descriptor fd
.
fd
The file descriptor returned by dio_open().
No value is returned.
Example #1 Closing an open file descriptor
<?php $fd = dio_open('/dev/ttyS0', O_RDWR); dio_close($fd); ?>
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https://www.php.net/manual/en/function.dio-close.php