install symfony demo with installer

app/public/index.php

@@ -0,0 +1,30 @@
+<?php
+
+use App\Kernel;
+use Symfony\Component\Dotenv\Dotenv;
+use Symfony\Component\ErrorHandler\Debug;
+use Symfony\Component\HttpFoundation\Request;
+
+require dirname(__DIR__).'/vendor/autoload.php';
+
+(new Dotenv())->bootEnv(dirname(__DIR__).'/.env');
+
+if ($_SERVER['APP_DEBUG']) {
+    umask(0000);
+
+    Debug::enable();
+}
+
+if ($trustedProxies = $_SERVER['TRUSTED_PROXIES'] ?? false) {
+    Request::setTrustedProxies(explode(',', $trustedProxies), Request::HEADER_X_FORWARDED_ALL ^ Request::HEADER_X_FORWARDED_HOST);
+}
+
+if ($trustedHosts = $_SERVER['TRUSTED_HOSTS'] ?? false) {
+    Request::setTrustedHosts([$trustedHosts]);
+}
+
+$kernel = new Kernel($_SERVER['APP_ENV'], (bool) $_SERVER['APP_DEBUG']);
+$request = Request::createFromGlobals();
+$response = $kernel->handle($request);
+$response->send();
+$kernel->terminate($request, $response);