web/public/teamtable/edit/update.php

<?php $app = require '../../../app/inc.php';

use App\Teamtable\Team;

$item = filter_input(INPUT_GET, 'item', FILTER_VALIDATE_INT);

$model = $app->model('Teamtable');

// item is NULL if not set
if ($item !== NULL)
{
    // check that team exists
    $team = $model->get($item);
    if (!$team)
    {
        // team does not exist
        $app->session->flash('Kunne ikke endre lag: Lag finnes ikke', 'danger');
        $app->redirect('index.php');
    }
}

// lets create a team
$app->view('template/header', ['title' => 'Endre lagdetaljer']);
$app->view('pages/teamtable/edit/update', ["team" => new Team]);
$app->view('template/footer');