gistfile1.php

<?php

class Container extends Pimple
{
    public function __construct()
    {
        $values = [
            'foobar' => function ($c) { /* do something */ },
            'foobar.extended' => $this->extend('foobar', function ($o, $c) { /* do something */ })
        ];
        
        parent::__construct($values);
    }
}