PSR standards

PSR-1 (Basic Coding Standard)

The codebase follows PSR-1 fundamentals for PHP files and class structure.

PSR-2 (Coding Style Guide)

PSR-2 is superseded by PSR-12; this project follows PSR-12.

PSR-4 (Autoloading)

The SDK uses PSR-4 autoloading for the SolveBeam\Twinfield\ namespace, configured in composer.json.

PSR-6 (Caching)

Examples use PSR-6 caching for token storage via symfony/cache.

• https://www.php-fig.org/psr/psr-6/
• https://github.com/php-fig/cache
• https://packagist.org/packages/psr/cache
• https://github.com/symfony/cache

PSR-7 (HTTP Messages)

The OAuth2 provider relies on PSR-7 request/response interfaces for HTTP messages.

PSR-18 (HTTP Client)

The library can work with PSR-18 HTTP clients. Suggested implementations are listed in composer.json (e.g., symfony/http-client, php-http/curl-client) along with a PSR-7 implementation such as nyholm/psr7.

PSR-12 (Coding Style)

Coding style follows PSR-12, enforced via the PHPCS ruleset in phpcs.xml.dist.