flarum/public/index.php

<?php

/*
 * This file is part of Flarum.
 *
 * For detailed copyright and license information, please view the
 * LICENSE file that was distributed with this source code.
 */

require '../vendor/autoload.php';

$server = new Flarum\Http\Server(
    Flarum\Foundation\Site::fromPaths([
        'base' => __DIR__.'/..',
        'public' => __DIR__.'/../public',
        'storage' => __DIR__.'/../storage',
    ])
);

$server->listen();