Knockout-Lite/app/Http/Controllers/IndexController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Knockout\Subforum;

class IndexController extends Controller {

    public function get(Request $request)
    {
        $subforums = Subforum::getCache();

        $len = count($subforums);
        $leftSubforums = array_slice($subforums, 0, $len / 2);
        $rightSubforums = array_slice($subforums, $len / 2);

        return view('page/index', [
            'leftSubforums' => $leftSubforums,
            'rightSubforums' => $rightSubforums
        ]);
    }

}