CompiledFactory2.php

<?php

class CompiledFactory2 implements FactoryInterface
{
    public function createService(ServiceLocatorInterface $sl)
    {
        $a = new A();
        $b = $sl->get('A');
        return new B(a);
    }
}

Factory1.php

<?php

class Factory1 implements FactoryInterface
{
    public function createService(ServiceLocatorInterface $sl)
    {
        $a = new A();
        return $a;
    }
}

Factory2.php

<?php

class Factory2 implements FactoryInterface
{
    public function createService(ServiceLocatorInterface $sl)
    {
        $b = $sl->get('A');
        return new B(a);
    }
}