variable to layout

You can set the variable from your controller, and then show the variable through a footer include:

app/Controllers/Cart.php

PHP Code:

<?php
namespace App\Controllers;
class Cart extends BaseController
{

    public function index()
    {
        $data['variable'] = "Footer variable";

        echo view('Cart/index', $data);
    }

} 


app/Views/templates/layout_user.php

PHP Code:

<?= $this->renderSection('content') ?>

<?= $this->include('\App\Views\templates\footer') ?>

app/Views/cart/index.php

PHP Code:

<?= $this->extend('App\Views\templates\layout_user') ?>
<?= $this->section('content'); ?> 
<p>Some cart content here</p>
<?= $this->endSection(); ?>

app/Views/templates/footer.php

PHP Code:

<p><?= $variable; ?></p> 


Display:

Code:

<p>Some cart content here</p>
<p>Footer variable</p>