Direct IO 函数
PHP 手册

dio_truncate

(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5)

dio_truncate Truncates file descriptor fd to offset bytes

说明

bool dio_truncate ( resource $fd , int $offset )

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.

参数

fd

The file descriptor returned by dio_open().

offset

The offset in bytes.

返回值

如果成功则返回 TRUE,失败则返回 FALSE

注释

Note: 本函数未在 Windows 平台下实现。


Direct IO 函数
PHP 手册