SplFileObject::ftruncate

(PHP 5 >= 5.1.0, PHP 7)

Truncates the file to a given length

public bool SplFileObject::ftruncate ( int $size )

Truncates the file to size bytes.

Parameters:

size

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:

Returns TRUE on success or FALSE on failure.

Examples:

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