rs-backend/handler/MyHandler.php

<?php
	use Adepto\Slim3Init\HandlerCaller;

	use Adepto\Slim3Init\{
		Handlers\Handler,
		Handlers\Route
	};

	use Psr\Http\Message\{
		ServerRequestInterface,
		ResponseInterface
	};

	class MyHandler extends Handler {
		public function soos(ServerRequestInterface $request, ResponseInterface $response, \stdClass $args): ResponseInterface {
			$lel[] = 'A';
			$lel[] = 'B';
			$lel[] = 'C';

			$lal['t'] = 'A';
			$lal['tt'] = 'B';
			$lal['ttt'] = 'C';
			$lal['tttt'] = 'D';

			$lol['a'] = $lel;
			$lol['b'] = $lal;

			return $response->withJson($lol);
		}

		public function error(ServerRequestInterface $request, ResponseInterface $response, \stdClass $args): ResponseInterface {
			throw new Error('Lol', 42);
		}

		public static function getRoutes(): array {
			return [
				new Route('GET', '/soos', 'soos'),
				new Route('GET', '/error', 'error'),
			];
		}
	}