Eio 函数
PHP Manual

eio_ftruncate

(PECL eio >= 0.0.1dev)

eio_ftruncateTruncate a file

说明

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.

参数

fd

Stream, Socket resource, or numeric file descriptor.

offset

Offset from beginning of the file

pri

请求的优先级: EIO_PRI_DEFAULT, EIO_PRI_MIN, EIO_PRI_MAX, or NULL. 如果是 NULL , pri 将设为 EIO_PRI_DEFAULT.

callback

callback 函数将在请求结束时被调用. 必须符合此原型:

void callback($data, $result);
$data 是传给该请求的特定数据. $result 包含特定请求的结果值, 通常是相应的系统调用的返回值.

data

Arbitrary variable passed to callback.

返回值

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

参见


Eio 函数
PHP Manual