Write to file

说明

resource eio_write ( int $fd , string &$str [, int $length = 0 [, int $offset = 0 [, int $pri = EIO_PRI_DEFAULT [, callable $callback = NULL [, mixed $data = NULL ]]]]] )

eio_write() writes up to length bytes from str at offset offset from the beginning of the file.

参数

fd

The file descriptor, e.g. returned by eio_open()

str

Source string

length

Maximum number of bytes to write.

offset

Offset from the beginning of file.

pri

请求的优先级: EIO_PRI_DEFAULT, EIO_PRI_MIN, EIO_PRI_MAX, or NULL. 如果是 NULL , pri 将设为 EIO_PRI_DEFAULT.

callback

callback 函数将在请求结束时被调用. 必须符合此原型:


void callback($data, $result);

$data 是传给该请求的特定数据. $result 包含特定请求的结果值, 通常是相应的系统调用的返回值.

data

Arbitrary variable passed to callback.

返回值

eio_write() returns request resource on success or FALSE on error.

参见

eio_open