typo3-conformance-php84

name	typo3-conformance-php84
description	PHP 8.4 coding standards for TYPO3 extension conformance. Property hooks, visibility, and modern patterns.
version	1.0.0
php_compatibility	8.4+
typo3_compatibility	13.0 - 14.x
related_skills	["typo3-conformance","php-modernization"]
triggers	["conformance php 8.4","extension standards php84"]

Extension Conformance with PHP 8.4

Compatibility: PHP 8.4+, TYPO3 v13.x and v14.x

Related Skills:

• typo3-conformance - Main conformance guide
• php-modernization/SKILL-PHP84 - PHP 8.4 features

---

1. PHP 8.4 Coding Standards

Recommended Patterns

Pattern	Standard
Property hooks	Use for validation/transformation
Asymmetric visibility	Prefer over private + getter
New array functions	Use over manual loops
#[\Deprecated]	Mark legacy code properly

---

2. PHP-CS-Fixer Configuration

<?php
// .php-cs-fixer.dist.php

$config = new PhpCsFixer\Config();

return $config
    ->setRules([
        '@PER-CS' => true,
        '@PER-CS:risky' => true,
        'declare_strict_types' => true,
        'trailing_comma_in_multiline' => [
            'elements' => ['arguments', 'arrays', 'match', 'parameters'],
        ],
        'nullable_type_declaration_for_default_null_value' => true,
    ])
    ->setRiskyAllowed(true)
    ->setFinder(
        PhpCsFixer\Finder::create()
            ->in(__DIR__ . '/Classes')
            ->in(__DIR__ . '/Tests')
    );

---

3. PHPStan Level 10

# phpstan.neon
parameters:
    phpVersion: 80400
    level: 10
    paths:
        - Classes
    treatPhpDocTypesAsCertain: false

---

4. Conformance Checklist for PHP 8.4

• All nullable parameters explicitly typed (?Type)
• declare(strict_types=1) in all files
• No single underscore class names
• #[\Deprecated] on legacy methods
• PHPStan level 9+ passing
• PHP-CS-Fixer with PER-CS

---

References

• typo3-conformance SKILL.md
• php-modernization SKILL-PHP84
• PER Coding Style

---

Credits & Attribution

This skill is part of the webconsulting.at TYPO3 skills collection.