ftruncate in PHP

ftruncate — Truncates a file to a given length
Syntax:

bool ftruncate ( resource $handle , int $size )
Takes the filepointer, handle, and truncates the file to length, size.

Parameters:

handle
The file pointer.

Note:
The handle must be open for writing.
size
The size to truncate to.

Note:
If size is larger than the file then the file is extended with null bytes.
If size is smaller than the file then the file is truncated to that size.
Return values: Returns TRUE on success or FALSE on failure.



Example #1 File truncation example

<?php
$filename = 'lorem_ipsum.txt';

$handle = fopen($filename, 'r+');
ftruncate($handle, rand(1, filesize($filename)));
rewind($handle);
echo fread($handle, filesize($filename));
fclose($handle);
?>


Note:
The file pointer is not changed.