(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
]]]] ) : resource
eio_truncate() causes the regular file named by path to be truncated to
a size of precisely length bytes
pathFile path
offsetOffset from beginning of the file.
priThe request priority: EIO_PRI_DEFAULT, EIO_PRI_MIN, EIO_PRI_MAX, or NULL.
If NULL passed, pri internally is set to
EIO_PRI_DEFAULT.
callback
callback function is called when the request is done.
It should match the following prototype:
void callback(mixed $data, int $result[, resource $req]);
datais custom data passed to the request.
resultrequest-specific result value; basically, the value returned by corresponding system call.
reqis optional request resource which can be used with functions like eio_get_last_error()
data
Arbitrary variable passed to callback.
eio_busy() returns request resource on success or FALSE on error.