Slim CSRF

Implements the PHP-FIG PSR-15 middleware standard, ensuring interoperability with other middleware and adherence to modern PHP practices.

Supports both per-request and per-session token persistence, allowing developers to balance security with convenience for AJAX-heavy applications, as detailed in the Token Persistence section.

Provides direct methods like getTokenName() and getTokenValue() for easy exposure in templating engines such as Twig, reducing boilerplate in views.

Allows overriding the default 400 error response with custom logic via setFailureHandler(), enabling tailored user experiences on CSRF validation failures.