Description:
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From manual page: http://www.php.net/language.oop5.visibility
---

In recent versions of PHP, we have introduced feature of namespaces.

I was thinking of the scenario where we can specify access specifier/visibility of classes also.

We may allow to access instantiation of the class inside namespace only if it's private.
Although I'm not sure about allowing the objects of that class outside the namespace but I think, it should be allowed in any case.

Example of encapsulating classes in namespace could be:
- Different payment classes may represent different payment methods.
- A payment manager class can only access the payment factory which will decide to instantiate particular type of payment class.
- In application, we would access payment class via manager class only. So manager class can behave like a public interface of payment entities.

Example:

namespace application/payment;

abstract class Payment {
    ...
}

private class TypePaypal extends Payment {
    ...
}

private class TypePaymentInAdvance extends Payment {
    ...
}

class PaymentFactory {
    ...
}