eio_truncate

(PECL eio >= 0.0.1dev)

eio_truncate — Truncate a file

说明

eio_truncate(
    string $path,
    int $offset = 0,
    int $pri = EIO_PRI_DEFAULT,
    callable $callback = NULL,
    mixed $data = NULL
): resource

eio_truncate() causes the regular file named by path to be truncated to a size of precisely length bytes

参数

path

File path

offset

Offset from beginning of the file.

pri

请求的优先级：EIO_PRI_DEFAULT，EIO_PRI_MIN，EIO_PRI_MAX 或 null。如果是 null，pri 将设为 EIO_PRI_DEFAULT。

callback

callback 函数在请求完成时被调用。其应匹配一下原型：

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

data: 传递给请求的用户数据。
result: 针对请求的结果的值。通常是相应的系统调用返回的值。
req: 可选的请求资源，可被 eio_get_last_error() 之类的函数使用。

data

Arbitrary variable passed to callback.

返回值

eio_busy() returns request resource on success, 或者在失败时返回 false.

参见

eio_ftruncate() - Truncate a file

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