PHP – Inject new class in child but not the parent

I’d like to inject a class in a child class, but not in the parent. How can I correct my code :

abstract class ParentAbstract {
    /** @var RegistryInterface */
    protected $doctrine;

    /** @var EntityManager */
    protected $entityManager;

    public function __construct(RegistryInterface $doctrine) {
        $this->doctrine = $doctrine;
        $this->entityManager = $doctrine->getManager();
    }
...
}

final class Child extends ParentAbstract {
    /** @var KernelInterface */
    protected $kernel;

    public function __construct(KernelInterface $kernel) {
        $this->kernel = $kernel;
    }
}

Even when I call the parent constructor it won’t work ! What should I do ?

Source: Symfony4 Questions

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#dependency-injection #inheritance #symfony4