dio_truncate
(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)
dio_truncate — Truncates file descriptor fd to offset bytes
說明
dio_truncate(resource
$fd, int $offset): bool
dio_truncate() truncates a file to at most
offset bytes in size.
If the file previously was larger than this size, the extra data is lost. If the file previously was shorter, it is unspecified whether the file is left unchanged or is extended. In the latter case the extended part reads as zero bytes.
返回值
成功時返回 true， 或者在失敗時返回 false。
註釋
注意: 此函式未在 Windows 平臺下實現。