phpstan improvements (#3092)

tests/phpstan-doctrine.php

@@ -0,0 +1,19 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use App\Kernel;
+use Symfony\Component\Dotenv\Dotenv;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+(new Dotenv(false))->loadEnv(dirname(__DIR__) . '/.env');
+$kernel = new Kernel($_SERVER['APP_ENV'], (bool) $_SERVER['APP_DEBUG']);
+$kernel->boot();
+
+return $kernel->getContainer()->get('doctrine')->getManager();