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dio_truncate

(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)

dio_truncate 截断文件描述符 fd 为 offset 字节

说明

dio_truncate(resource $fd, int $offset): bool

dio_truncate() 将文件截断为最多 offset 字节的大小。

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.

参数

fd

dio_open() 返回的文件描述符。

offset

偏移字节。

返回值

成功时返回 true, 或者在失败时返回 false

注释

注意: 此函数未在 Windows 平台下实现。

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