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This document uses PHP Chinese website manual Release
(PECL eio >= 0.0.1dev)
eio_ftruncate — Truncate a file
$fd
[, int $offset
= 0
[, int $pri
= EIO_PRI_DEFAULT
[, callable $callback
= NULL
[, mixed $data
= NULL
]]]] ) eio_ftruncate() causes a regular file referenced by
fd
file descriptor to be truncated to precisely
length
bytes.
fd
Stream, Socket resource, or numeric file descriptor.
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
.
eio_ftruncate() returns request resource on success or FALSE
on error.