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This document uses PHP Chinese website manual Release
(PECL eio >= 0.0.1dev)
eio_truncate — Truncate a file
$path
[, int $offset
= 0
[, int $pri
= EIO_PRI_DEFAULT
[, callable $callback
= NULL
[, mixed $data
= NULL
]]]] ) eio_truncate() causes the regular file named by path
to be truncated to
a size of precisely length
bytes
path
File path
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_busy() returns request resource on success or FALSE
on error.