eio_seek
(PECL eio >= 0.5.0b)
eio_seek — Seek to a position
说明
eio_seek(
mixed
int
int
int
callable
mixed
): resource
mixed
$fd,int
$offset,int
$whence,int
$pri = EIO_PRI_DEFAULT,callable
$callback = NULL,mixed
$data = NULL): resource
eio_seek() repositions the offset of the open file associated with
stream, Socket instance, or file descriptor specified by fd to
the argument offset according to
the directive whence.
参数
fd-
Stream, Socket instance, or numeric file descriptor.
offset-
Starting point from which data is to be read.
whence-
whencevalues are:EIO_SEEK_SET- Set position equal tooffsetbytes.EIO_SEEK_CUR- Set position to current location plusoffset.EIO_SEEK_END- Set position to end-of-file plusoffset.
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_seek() returns request resource on success, 或者在失败时返回 false.
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