This middleware implements the PSR-15 MiddlewareInterface and can be helpful to prevent XSS attacks.
composer require dmt-software/anti-xss-middleware
use DMT\Http\AntiXss\Middleware\AntiXssMiddleware;
use Psr\Http\Message\ResponseFactoryInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\RequestHandlerInterface;
/** @var ResponseFactoryInterface $responseFactory */
$antiXssMiddleware = new AntiXssMiddleware($responseFactory);
/** @var ServerRequestInterface $request */
/** @var RequestHandlerInterface $handler */
$response = $antiXssMiddleware->process($request, $handler);
if ($response->getStatusCode() === 400) {
// cross site scripting detected
}