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 or FALSE
on error.
参见
- eio_ftruncate