eio_truncate
(PECL eio >= 0.0.1dev)
eio_truncate — Truncate a file
说明
eio_truncate(
string
int
int
callable
mixed
): resource
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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