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# dio_truncate

(PHP 4 >= 4.2.0, PHP 5)

dio_truncate -- Truncates file descriptor fd to offset bytes

## Description

bool dio_truncate ( resource fd, int offset )

Function dio_truncate() causes the file referenced by fd to be truncated 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. 成功回傳`TRUE`失敗回傳`FALSE`。.

> 注: 此函數不適用於 Windows 平台。

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