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# eio_ftruncate

(PECL eio >= 0.0.1dev)

eio_ftruncate — Truncate a file

### Description

resource eio_ftruncate ( mixed `$fd` [, int `$offset` = 0 [, int `$pri` = EIO_PRI_DEFAULT [, callable `$callback` = NULL [, mixed `$data` = NULL ]]]] )

eio_ftruncate() causes a regular file referenced by `fd` file descriptor to be truncated to precisely `length` bytes.

### Parameters

`fd`

  Stream, Socket resource, or numeric file descriptor.

`offset`

  Offset from beginning of the file

`pri`

  The request priority: `EIO_PRI_DEFAULT`, `EIO_PRI_MIN`, `EIO_PRI_MAX`, or `NULL`. If `NULL` passed, `pri` internally is set to `EIO_PRI_DEFAULT`.

`callback`

  `callback` function is called when the request is done. It should match the following prototype:

  `void callback(mixed $data, int $result[, resource $req]);`
  `data`

    is custom data passed to the request.

  `result`

    request-specific result value; basically, the value returned by corresponding system call.

  `req`

    is optional request resource which can be used with functions like eio_get_last_error()

`data`

  Arbitrary variable passed to `callback`.

### Return Values

eio_ftruncate() returns request resource on success or `FALSE` on error.

### See Also

- eio_truncate

eio_fsync
eio_futime
Eio Functions
PHP Manual