eio_seek

(PECL eio >= 0.5.0b)

eio_seek — Repositions the offset of the open file associated with the fd argument to the argument offset according to the directive whence

說(shuō)明

eio_seek(
    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 resource, or file descriptor specified by fd to the argument offset according to the directive whence as follows:

EIO_SEEK_SET - Set position equal to offset bytes.
EIO_SEEK_CUR - Set position to current location plus offset.
EIO_SEEK_END - Set position to end-of-file plus offset.

參數

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

請求的優(yōu)先級：EIO_PRI_DEFAULT，EIO_PRI_MIN，EIO_PRI_MAX 或 null。如果是 null，pri 將設為 EIO_PRI_DEFAULT。

callback

callback 函數在請求完成時(shí)被調用。其應匹配一下原型：


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

data: 傳遞給請求的用戶(hù)數據。
result: 針對請求的結果的值。通常是相應的系統調用返回的值。
req: 可選的請求資源，可被 eio_get_last_error() 之類(lèi)的函數使用。

data

Arbitrary variable passed to callback.

返回值

eio_seek() returns request resource on success, 或者在失敗時(shí)返回 false.

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eio_seek

說(shuō)明

參數

返回值