(PECL eio >= 0.0.1dev)
eio_truncate — Truncate a file
$path,$offset = 0,$pri = EIO_PRI_DEFAULT,$callback = NULL,$data = NULL
eio_truncate() causes the regular file named by path to be truncated to
a size of precisely length bytes
pathoffsetpriEIO_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]);dataresultreqdatacallback.
eio_busy() returns request resource on success, 或者在失败时返回 false.