Flarum\Http\Middleware\ParseJsonBody::__invoke PHP Метод

    public function __invoke(Request $request, Response $response, callable $out = null)
    {
        if (str_contains($request->getHeaderLine('content-type'), 'json')) {
            $input = json_decode($request->getBody(), true);
            $request = $request->withParsedBody($input ?: []);
        }
        return $out ? $out($request, $response) : $response;
    }