(PHP 5 >= 5.1.0)
SplFileObject::ftruncate — Truncates the file to a given length
Truncates the file to size bytes.
The size to truncate to.
Note: If size is larger than the file it is extended with null bytes.
If size is smaller than the file, the extra data will be lost.
Returns TRUE on success or FALSE on failure.
Example #1 SplFileObject::ftruncate example
<?php
// Create file containing "Hello World!"
$file = new SplFileObject("/tmp/ftruncate", "w+");
$file->fwrite("Hello World!");
// Truncate to 5 bytes
$file->ftruncate(5);
// Rewind and read data
$file->rewind();
echo $file->fgets();
?>
The above example will output something similar to:
Hello