   #PHP Manual Direct IO functions dio_tcsetattr dio_write

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                                 dio_truncate

   (PHP 4 >= 4.2.0)
   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.
   Returns TRUE on success or FALSE on failure..
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