Eio 函数
PHP Manual

eio_ftruncate

(PECL eio >= 0.0.1dev)

eio_ftruncateTruncate a file

说明

resource eio_ftruncate ( int $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

The 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