ECC / rules

---
description: "PHP coding style extending common rules"
globs: ["**/*.php", "**/composer.json"]
alwaysApply: false
---
# PHP Coding Style

> This file extends the common coding style rule with PHP specific content.

## Standards

- Follow **PSR-12** formatting and naming conventions.
- Prefer `declare(strict_types=1);` in application code.
- Use scalar type hints, return types, and typed properties everywhere new code permits.

## Immutability

- Prefer immutable DTOs and value objects for data crossing service boundaries.
- Use `readonly` properties or immutable constructors for request/response payloads where possible.
- Keep arrays for simple maps; promote business-critical structures into explicit classes.

## Formatting

- Use **PHP-CS-Fixer** or **Laravel Pint** for formatting.
- Use **PHPStan** or **Psalm** for static analysis.