# dio_read

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

dio_read — Reads bytes from a file descriptor

### 说明

dio_read ( resource `$fd` [, int `$len` = 1024 ] ) : string

The function dio_read() reads and returns `len` bytes from file with descriptor `fd`.

### 参数

`fd`

  The file descriptor returned by dio_open().

`len`

  The number of bytes to read. If not specified, dio_read() reads 1K sized block.

### 返回值

The bytes read from `fd`.

### 参见

- dio_write() - Writes data to fd with optional truncation at length