Bramus\Router\Router::run PHP Method

    public function run($callback = null)
    {
        // Define which method we need to handle
        $this->requestedMethod = $this->getRequestMethod();
        // Handle all before middlewares
        if (isset($this->beforeRoutes[$this->requestedMethod])) {
            $this->handle($this->beforeRoutes[$this->requestedMethod]);
        }
        // Handle all routes
        $numHandled = 0;
        if (isset($this->afterRoutes[$this->requestedMethod])) {
            $numHandled = $this->handle($this->afterRoutes[$this->requestedMethod], true);
        }
        // If no route was handled, trigger the 404 (if any)
        if ($numHandled === 0) {
            if ($this->notFoundCallback && is_callable($this->notFoundCallback)) {
                call_user_func($this->notFoundCallback);
            } else {
                header($_SERVER['SERVER_PROTOCOL'] . ' 404 Not Found');
            }
        } else {
            if ($callback) {
                $callback();
            }
        }
        // If it originally was a HEAD request, clean up after ourselves by emptying the output buffer
        if ($_SERVER['REQUEST_METHOD'] == 'HEAD') {
            ob_end_clean();
        }
        // Return true if a route was handled, false otherwise
        if ($numHandled === 0) {
            return false;
        }
        return true;
    }