<?php

use Symfony\Component\DependencyInjection\ContainerBuilder;

interface Fooable
{
    public function doFoo() : int;
}

class Foo implements Fooable
{
    public function doFoo() : int
    {
        return 9;
    }
}

class Bar implements Fooable
{
    private $foo;
    
    public function __construct(Foo $foo)
    {
        $this->foo = $foo;
    }
    
    public function doFoo() : int
    {
        return $this->foo->doFoo() + 1;
    }
}

// create service definitions in container builder
$containerBuilder = new ContainerBuilder();
$fooDefinition = $containerBuilder->autowire('Foo', Foo::class)
    ->setPublic(true);
$containerBuilder->autowire('Bar', Bar::class)
    ->setPublic(true)
    ->setDecoratedService('Foo', 'Foo.inner')
    ->setArgument('Foo', $fooDefinition);
$containerBuilder->compile();

// Calling the decorated "Foo" service, that is now an instance of Bar
dump($containerBuilder->get('Foo')->doFoo());

^ 10

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PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8