ROUNDDOWN calculation

[NathanDid]

This is:

- [x] a bug report
- [ ] a feature request
- [ ] **not** a usage question (ask them on https://stackoverflow.com/questions/tagged/phpspreadsheet or https://gitter.im/PHPOffice/PhpSpreadsheet)

Hello,

I've found an issue with ROUNDDOWN usage (tested with 1.29.2, 3.3.0 versions. It is working for 1.29.1 version).
I've read that results can be different with php8.4 but I'm using php8.3 right now.

Do I have to lock my phpoffice/phpspreadsheet version to 1.29.1 till I'm not using php8.4 ?

What is the expected behavior?

$calculation->calculateFormula('=ROUNDDOWN(249.9975,0)') // Should return 249

What is the current behavior?

$calculation->calculateFormula('=ROUNDDOWN(249.9975,0)') // Returns 250 with 1.29.2 and 3.3.0 versions

What are the steps to reproduce?

<?php

require __DIR__ . '/vendor/autoload.php';

// Create new Spreadsheet object
$calculation = new Calculation();
$res = $calculation->calculateFormula('=ROUNDDOWN(249.9975,0)');

What features do you think are causing the issue

• Reader
• Writer
• Styles
• Data Validations
• Formula Calculations
• Charts
• AutoFilter
• Form Elements

Which versions of PhpSpreadsheet and PHP are affected?

1.29.2 and 3.3.0 versions for php8.3

[oleibman]

These functions (ROUNDDOWN, ROUND, ROUNDUP, TRUNC) are tough to get right. We have many test cases, and continue to add to those as users like yourself report problems, or as we notice problems when Php changes (or will change) things. I will have to investigate what is going wrong here.