Modifying Pimple/Slim container - php

Question

I would like to be able to modify an array on a Pimple container, however, because the services are frozen by Pimple this seems to be impossible.
I have tried the extend() method on the container, however, due to my array not being an object I am unable to modify it.
$container = new Slim\Container();
$container['config'] = ['foo'=>'bar'];
// .... do some other stuff.
$container['config']['baz'] = 'Harry'; // throws an error regarding indirect modification
Using extend
$container = new Slim\Container();
$container['config'] = ['foo'=>'bar'];
$container->extend('config',function($config,$container){
$config['baz'] = 'Harry';
return $config;
});
// throws an error PHP Fatal error: Uncaught InvalidArgumentException: Identifier "config" does not contain an object definition.
Is there no way to modify a definition inside Pimple container? Currently I am passing around a $config array by reference prior to instantiating the container which is less than ideal!
Thanks in advance

Answer 1

You can do this by unsetting the container value first.
Pimple freezes values but will allow you to remove them.
$container = new Slim\Container();
$container['config'] = ['foo'=>'bar'];
unset($container['config']);
$container->extend('config',function($config,$container){
$config['baz'] = 'Harry';
return $config;
});

Answer 2

Sorry, it turns out that I can just wrap the $config in a function to achieve desired results.
$container = new Slim\Container();
$config = ['foo'=>'bar'];
$container['config'] = function($container) use($config){
return $config;
};
$container->extend('config',function($config,$container) {
$config['baz']='Harry';
return $config;
});
print_r($container['config']);
// foo=>bar, baz=>Harry