Tiny procedural MVC example, with template and nested views.

33.php

<?php
// passed from rewrite
$_GET['controller'] = ''; // index page

// controllers map
$controllers = [
    ''       => 'index.php',
    'foobar' => 'foobar.php'
];

// mock a view - would use ob_start() ob_end_clean().
function view($template, $vars) {
    return 'Loaded: '.$template.' - with: '.print_r($vars, true).PHP_EOL;
}

// mock some vars (model)
$vars = [
    'result' => ['foo'=>'bar']    
];

// simplist form of a router
// check the file_exists not !empty() then based upon that show a 404 page/controller
echo !empty($controllers[$_GET['page']]) ? view(
    'template.php',
    $vars+[
        'body' => view('./controller/'.$controllers[$_GET['page']].'.php', $vars)
    ]
) : view(
    'template.php',
    $vars+[
        'body' => view('./controller/not_found.php', [])
    ]
);