Eio 函数
PHP 手册

eio_seek

(PECL eio >= 0.5.0b)

eio_seekRepositions the offset of the open file associated with the fd argument to the argument offset according to the directive whence

说明

resource eio_seek ( mixed $fd , int $offset , int $whence [, int $pri = EIO_PRI_DEFAULT [, callable $callback = NULL [, mixed $data = NULL ]]] )

eio_seek() repositions the offset of the open file associated with stream, Socket resource, or file descriptor specified by fd to the argument offset according to the directive whence as follows:

参数

fd

Stream, Socket resource, or numeric file descriptor

offset

Starting point from which data is to be read.

length

Number of bytes to be read.

pri

请求的优先级:EIO_PRI_DEFAULTEIO_PRI_MINEIO_PRI_MAXNULL。如果是 NULLpri 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 or FALSE on error.


Eio 函数
PHP 手册