# dio_close

(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)

dio_close — Closes the file descriptor given by fd

### 说明

dio_close ( resource `$fd` ) : void

The function dio_close() closes the file descriptor `fd`.

### 参数

`fd`

  The file descriptor returned by dio_open().

### 返回值

没有返回值。

### 范例

Example #1 Closing an open file descriptor

    <?php
    $fd = dio_open('/dev/ttyS0', O_RDWR);

    dio_close($fd);
    ?>

### 参见

- dio_open() - Opens a file (creating it if necessary) at a lower level than the C library input/ouput stream functions allow