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<?php
namespace Yiisoft\Yii\Web\Middleware;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Message\ResponseInterface;
/**
* Chain executes middlewares in the order they are added to constructor.
*
* Use if you need to execute middlewares before or after the middleware
* you already have.
*/
final class Chain implements MiddlewareInterface
{
private $middlewares;
public function __construct(MiddlewareInterface ...$middlewares)
$this->middlewares = $middlewares;
}
public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
for ($i = count($this->middlewares) - 1; $i > 0; $i--) {
$handler = $this->wrap($this->middlewares[$i], $handler);
return $this->middlewares[0]->process($request, $handler);
* Wraps handler by middlewares
private function wrap(MiddlewareInterface $middleware, RequestHandlerInterface $handler): RequestHandlerInterface
return new class($middleware, $handler) implements RequestHandlerInterface {
private $middleware;
private $handler;
public function __construct(MiddlewareInterface $middleware, RequestHandlerInterface $handler)
$this->middleware = $middleware;
$this->handler = $handler;
public function handle(ServerRequestInterface $request): ResponseInterface
return $this->middleware->process($request, $this->handler);
};
yiisoft /
yii-web
