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SplFileObject::ftell	SplFileObject::fwrite

SplFileObject	Last updated: Mon, 26 Oct 2026

SplFileObject::ftruncate

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

SplFileObject::ftruncate — Truncates the file to a given length

Description

public function SplFileObject::ftruncate(int $size): bool

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.

Return Values

Returns true on success or false on failure.

Examples

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

See Also

ftruncate() - Truncates a file to a given length

SplFileObject::ftell	SplFileObject::fwrite

SplFileObject	Last updated: Mon, 26 Oct 2026